Projectile Motion: 3 methods to answer ALL questions!

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  • Опубліковано 21 лис 2024

КОМЕНТАРІ • 408

  • @ThatPhysicsGuy
    @ThatPhysicsGuy  3 місяці тому +40

    I have added the PDF file in the description, you can download it for free for your studies.
    Feel free to comment and ask questions!
    Update:
    On time 4:18 there is a mistake
    The formula will be:
    s = { (v+u)/2 }÷t

    • @chemicalnamesargon
      @chemicalnamesargon 3 місяці тому +3

      thank you so much for making high quality and concise education free for us. ❤

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  3 місяці тому +5

      welcome!

    • @sammtr2327
      @sammtr2327 2 місяці тому +2

      The best video I've ever seen on yt. Thanks alot❤🎉😢

    • @Unknown89077
      @Unknown89077 2 місяці тому

      @@ThatPhysicsGuy thanks a lot brother

    • @Coolrandomstranger
      @Coolrandomstranger Місяць тому +1

      On 6.56 I got 26.28 instead of 28.28 but how

  • @kiKi-zl4jp
    @kiKi-zl4jp 3 місяці тому +119

    How is this guy soo underrated? Lecturers often use formulas out of Nowhere and do not say the reason why? This guy is literally the best 😤

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  3 місяці тому +28

      idk man, maybe i am underrated cause i can only give one video per month.
      don't worry, i will make this channel a library of important topic wise explanations!

    • @Random13Guy
      @Random13Guy 2 місяці тому +2

      ​@@ThatPhysicsGuy try to keep uploading good sir

  • @NotPikachuWasTaken
    @NotPikachuWasTaken Місяць тому +35

    Got my kinematics test today, this is unironically the best yt video on AP Physics

  • @user81j2va9q9n
    @user81j2va9q9n 23 дні тому +3

    ThatPhysicsGuy ilysm You have opened my mind to never before known concepts. You're way of teaching has made me ascent to the heavens above of the physics world.

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  23 дні тому

      you have complimented my videos in a way no one has as of now! thank you!!!

  • @LauraSuarez-vx8ii
    @LauraSuarez-vx8ii 3 дні тому

    Honestly just please keep posting, this was so helpful in every single aspect. Thank you so much.

  • @Boom-dv6fw
    @Boom-dv6fw Місяць тому +3

    Truly the BEST video i have seen about kinematics. Honestly, I was first a bit skeptical but I was so surprised how well i understood it after struggling for 2 years with this topic. Please upload more such videos especially focusing on grade 12 topics. THANK YOU

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  Місяць тому

      i will upload videos slowly. Thanks a lot for thr comment!!

  • @seharkayy
    @seharkayy Місяць тому +4

    Finally i understood why sometimes sin is used for the horizontal axis and cos for the vertical!
    And also why the value of g is negative in some projectile motions even when the ball is going downwards.
    Not even my textbooks made these things clear.
    Thank you so much!! I have my A-level physics exams in 10 days and you have clarified everything! ❤️

  • @MalharBhokare-bg8ue
    @MalharBhokare-bg8ue 3 місяці тому +33

    This is legit the best vid out there on projectile motion questions ..... unique and short explaination saved a lot of my time ... thanks..

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  3 місяці тому

      thank you! your comment will help a lot. now more students can watch this on their homepage!
      I will keep posting chapter-wise content so subscribe!

  • @sadiaaaaaaaaaaaaaaaaa
    @sadiaaaaaaaaaaaaaaaaa 4 дні тому

    i love this so much. i never comment on videos, but this actually helped me. i'm an ib student with almost 0 prerequisites in physics. in every other video i watched, they always pick the easy questions to showcase the "process of solving" but this one actually shows harder questions and how to solve them! love it :3

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  4 дні тому

      thank you! i am trying to add more and more videos and in the future will add tough maths too so that you guys can do better

  • @president_pwu
    @president_pwu 2 місяці тому +12

    Keep uploading bro you make concepts way easier to understand

  • @quirky-r5d
    @quirky-r5d 2 місяці тому +4

    dude u are like a ✨knight in the shining armor✨ for students . Great work man!!

  • @heytherebuddy2513
    @heytherebuddy2513 26 днів тому +1

    Soo grateful that I found this channel 💓

  • @LanceHeinen
    @LanceHeinen День тому

    This is an absolutely amazing video about covering projectile motion, youve gained a subscriber! Ill be waiting for the day some more topics come out

  • @AadhiVedant
    @AadhiVedant 2 місяці тому +4

    Keep going ❤
    You literally owned many of our respect

  • @pess1r
    @pess1r Місяць тому +1

    You sir are an amazing person. The way you explained it with so much ease made me understand everything that my teacher did not teach. Thank you very much❤

  • @Gabeiscool08
    @Gabeiscool08 2 місяці тому +2

    Explained it better than my teacher! ❤

  • @OwenLutepo
    @OwenLutepo 28 днів тому

    Hats off sirs this is the best projectile motion video on earth unlike the others who make you memorize stuff

  • @samhenry8014
    @samhenry8014 2 місяці тому +9

    Thank you so much. I had difficulties in understanding the concept, but after seeing your lecture I feel so confident. Thank you once again 😊😊😊

  • @crucifythanlearn
    @crucifythanlearn 18 днів тому +1

    the tip for cos was so helpful

  • @bugradogan2431
    @bugradogan2431 8 днів тому

    you even added sound effects to the animation!great video thanks a lot

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  8 днів тому

      trying to make something different here. thanks for noticing!!

  • @Unknown89077
    @Unknown89077 2 місяці тому +1

    How I didn't get you before my 11th started you are too good. 😮

  • @saxongroenintwoud8404
    @saxongroenintwoud8404 29 днів тому

    legit saved my physics exam thanks man

  • @inupinu9209
    @inupinu9209 9 днів тому +1

    THanks man. Just started als and this vid is truly helpful. KEep makin more plss!!

  • @LT_WARWOLF
    @LT_WARWOLF 22 дні тому

    Thank you so much Sir 🫡 May God richly bless you 🙏

  • @MarieVermont-b7i
    @MarieVermont-b7i 2 місяці тому +1

    my guy seriously you deserve more love and attention like seriously no joke

  • @hamss-h1p
    @hamss-h1p 16 днів тому

    10/10 video i hope your channel blows up, keep up the good work

  • @moony791
    @moony791 2 місяці тому

    Bro you explained this better than my teacher, my midterms are in a few days and I couldnt understand anything, tysmmm

  • @DigantaHowlader-zh8tw
    @DigantaHowlader-zh8tw 2 місяці тому +1

    you just got a subscriber man! WHAT A GREAT VIDEO!!! This is literally the best video on projectile motion on youtube. Keep it up!

  • @Srthropodano
    @Srthropodano Місяць тому

    You are way better than our physics teacher 😂 love your vids ❤

  • @mathfinity333
    @mathfinity333 Місяць тому

    The way you teach is incredibly good. Try uploading new videos. You can also create playlist on certain topics .❤

  • @nuhamufeel
    @nuhamufeel 15 днів тому

    this is the best video available on projectile motion, pls upload more videoss on different topic ;) your new subscriber

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  15 днів тому +1

      thank you for subscribing!
      i will slowly upload for all topics

  • @Madnessmanabhay
    @Madnessmanabhay 2 місяці тому +3

    This is insane man 🗣️💥💥💥

  • @IHTA_HP
    @IHTA_HP 8 днів тому

    Please make a-level physics videos you're so good at explaining and teaching.😭

  • @MohitKumarSingh-m1v
    @MohitKumarSingh-m1v 2 місяці тому +1

    Bro you and your explanation is very awesome❤, I just randomly clicked this video and I fully revised projectile motion 😀

  • @Karnampatel
    @Karnampatel 2 місяці тому

    crazy vid bro. I have been failing physics rn and this makes so much more sense.

  • @Vanshikhasharan
    @Vanshikhasharan 2 місяці тому +2

    Plzz make more such videos .... will be waiting for these videos 😊

  • @maths01n
    @maths01n 4 дні тому

    Good work my fellow Mathematician ❤ keep growing I have subscribed

  • @zaiizaiiiii
    @zaiizaiiiii Місяць тому

    best video ever on projectiles

  • @AshuRa-rz8mu
    @AshuRa-rz8mu 2 місяці тому +2

    Can you make such videos of different chapters such as straight line, circular motion,etc. It will be really helpful and this video also really helped me a lot 😃👍

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  2 місяці тому

      working on momentum video. will do all eventually!

  • @parthasarathisowmyanarayan7975
    @parthasarathisowmyanarayan7975 2 місяці тому

    best projectile motion videos ever found on youtube bro. keep posting long videos bro please

  • @DivN-nb8ui
    @DivN-nb8ui Місяць тому

    Bro amazing work you have done there!! Keep going!

  • @seohahahaha1633
    @seohahahaha1633 Місяць тому +2

    THANK YOU SO MUCH 😭😭😭😭😭😭

  • @pontisarwar167
    @pontisarwar167 3 місяці тому +2

    Great content for the students, thank you ❤

  • @MuthuYohiraaj
    @MuthuYohiraaj 2 місяці тому

    Pls make more and more such videos and THANKS A TON for clearing my doubts in projectile motion

  • @NabihaRizwan-d3t
    @NabihaRizwan-d3t Місяць тому

    Waittt a minnnnnn. ,…….omggggg can you pleaseeeee makeeee more videooooooosssssssssssssssss this is toooo gooooooddd❤❤❤❤❤

  • @rameshramanna4822
    @rameshramanna4822 2 місяці тому

    Thanks brother for your wonderful video now I understood the topic more clearly

  • @Kanekikun007
    @Kanekikun007 2 місяці тому +1

    Goated video plz bring it on more chapters

  • @AlbertGanizani
    @AlbertGanizani Місяць тому

    Watching from malawi.. great job,,, 😮

  • @AnushkaKumari-qf7tw
    @AnushkaKumari-qf7tw 2 місяці тому +2

    As a student I wanna suggest you that upload videos of every chapters
    And now kinematics is more important so do 1-D ,2-D,3-D all chapters video and very good contents such a mind blowing video loved it ❤

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  2 місяці тому

      this is an awesome advice, i will definitely look into this then. THANKS!

    • @AnushkaKumari-qf7tw
      @AnushkaKumari-qf7tw 2 місяці тому

      @@ThatPhysicsGuy Thank you for listening to me😊 but be fastt tooo....👍

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  2 місяці тому

      i try to comment fast. i have a small audience and mainly you guys might ask questions that needs explanation. making a video takes time but replying takes literally seconds

  • @atul_.biloniya
    @atul_.biloniya 2 місяці тому

    You are doing a great job ,bro full support 💪

  • @shivanggusain7230
    @shivanggusain7230 2 місяці тому

    Bro the concept ends at different height is tough but with your explanation make it easier to solve

  • @hayruuu1500
    @hayruuu1500 2 місяці тому

    I love ur video! I can see u getting more popular!

  • @Labyrinth33
    @Labyrinth33 23 дні тому

    Hey man loved your videos. You should start uploading more!!!!

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  23 дні тому

      thanks man! really trying but my day job is taking up my time. but i really appreciate the comments!!

  • @waqaar7804
    @waqaar7804 3 місяці тому +1

    you made it sooo easy! Can you make a video on stress-strain graphs.

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  3 місяці тому +1

      I am slowly covering all of the topics. Soon you will find everything here!

  • @prathameshmali4713
    @prathameshmali4713 2 місяці тому +2

    Pls make a video on rotational motion and centre of mass as well ❤

  • @MeirabaMangang-w3s
    @MeirabaMangang-w3s 2 місяці тому +2

    So helpful. Thanks Sir.

  • @MR.PIYUSHSINGH
    @MR.PIYUSHSINGH 2 місяці тому

    Thanks so much sir please keep your videos understanding simple as its in others topics 👍💕 also thanks for yours pdf

  • @kkkiyaaaaa4153
    @kkkiyaaaaa4153 Місяць тому

    thank you so much, i finally understand the topic!

  • @nrh5643
    @nrh5643 2 місяці тому +1

    You HAD to upload this after my AS physics exam lol, but regardless great video (:

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  2 місяці тому +1

      sad. trying to upload faster but my schedule is SO booked.

  • @farzanakhan9364
    @farzanakhan9364 Місяць тому

    can we please get a video the basic things we must know about waves topic? By the way, thanks for the video. I feel a bit more confident in solving questions now

  • @rereaz0n416
    @rereaz0n416 Місяць тому

    can u make videos on forces? (buoyancy friction drag etc) this video was incredible

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  Місяць тому

      working on it, will take some time but i will upload them all

  • @MocharlaHanumayamma
    @MocharlaHanumayamma 2 місяці тому

    Please explain inclined projectile brother your information is moreeeeeeeee valuable than ever in UA-cam thank you for your knowledge

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  2 місяці тому

      inclined projectile?
      like what would happen if a ball falls on an inclined plane?
      even for those matha you can use the same methods i have explained here

    • @MocharlaHanumayamma
      @MocharlaHanumayamma 2 місяці тому

      @@ThatPhysicsGuy thank you brother

  • @danicaherselman6373
    @danicaherselman6373 3 місяці тому +1

    thank you for the video! Can you make an in depth discussion about magnetic and electric fields? Or a video expanding on everything you said in the unit 4 need to know videos regarding magnetic and electric fields? It is the topic I struggle with the most in Unit 4 IAL Edexcel. Thanks!!! :)

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  3 місяці тому

      Yeah sure! I am working on AS electricity now, i will start A2 magnetic and electricity field right after that, ok?
      also, if you have specific questions you can email me on the channel's email so that i can provide better answers and provide you with more links and worksheets

  • @rajdeepdas7616
    @rajdeepdas7616 2 місяці тому

    Thank you sooooo much for this❤please make a such video on rotational Motion🙏

  • @ryanelbowirrat1867
    @ryanelbowirrat1867 Місяць тому

    Ngl best vid ob projectile motion

  • @Physics-j6c
    @Physics-j6c 2 місяці тому

    Sir, please upload this type of animation of conceptual topics, it helps us a lot...
    I really like ur channel and content😊❤

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  2 місяці тому +1

      THANK YOU!
      I am working on new topics!

    • @Physics-j6c
      @Physics-j6c 2 місяці тому

      @@ThatPhysicsGuy sir, content was too attractive for me...
      Please keep on this your channel will grow more, even in very less time believe me..

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  2 місяці тому +1

      sure! i will keep posting!

    • @Physics-j6c
      @Physics-j6c 2 місяці тому

      @@ThatPhysicsGuy 💙❤️

  • @kjsingh8767
    @kjsingh8767 2 місяці тому

    Good job brother, u made it very easy to understand through visuals... pls make more vidios like this in future 🤗🤗
    Already liked and subscribed

  • @ToxicArc
    @ToxicArc 2 місяці тому

    thats, truly a better one. keep up!

  • @joginderpalsuman5669
    @joginderpalsuman5669 2 місяці тому

    Respect for you 💯 ❤

  • @salmayasser9163
    @salmayasser9163 10 днів тому

    Thank you sir for this amazing video , can you please do a video about projectiles where it hits a wall and rebounds ?

    • @salmayasser9163
      @salmayasser9163 10 днів тому

      I saw a question where a projectile hit a wall with a 90 degree angle then we assumed the vertical speed at this moment is 0 why is that ?

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  10 днів тому

      that's a good question. i will keep this in mind and try to include this too

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  10 днів тому

      when something moved horizontally, the vertical component is zero. that's why

  • @Gloria_1758
    @Gloria_1758 Місяць тому

    Great video!❤
    Can you please make a video on position time graph and velocity? (Class 11 syllabus)

  • @Tamjiro.66
    @Tamjiro.66 2 місяці тому

    The two vectors a and in the figure have equal magnitudes of 12.9 m and the angles are 01 = 28° and 02 = 109º Find (a) the x component and (b) the y component of their vector sum 7, (c) the magnitude of 7, and (d) the angle 7 makes with the positive
    direction of the x axis.

  • @JustinAlhwayek
    @JustinAlhwayek Місяць тому

    Dude you are the best

  • @TheRoche96
    @TheRoche96 2 місяці тому

    AMAZING VIDEO KEEP GOING BROTHA

  • @champkid1001
    @champkid1001 Місяць тому

    THANK YOU VERY MUCH 😁😁

  • @Koustubh_nayak
    @Koustubh_nayak 2 місяці тому

    Happy to be the 700th subscriber ❤

  • @SawairaArif-n4v
    @SawairaArif-n4v Місяць тому

    Can you do a video on dimensions too?? Please

  • @Spidey_Gami
    @Spidey_Gami Місяць тому

    where r u from brother best explanation that even our school cant provide

  • @adeebmahmood
    @adeebmahmood 2 місяці тому

    Here before it blows up some day 🎉

  • @tornadoboi3702
    @tornadoboi3702 Місяць тому +1

    Could you do one for Newton laws of motion too?? And circular motion?

  •  Місяць тому +1

    first physics test tomorrow and im just realizing i do not know how to do any of this, wish me luck

  • @shadowscythes
    @shadowscythes Місяць тому

    Thanks for being the only person I found who explained that you have to use negative acceleration when the projectile is going both up and down, that was confusing the heck out of me cause I didn't know whether to make it positive or negative when the entire motion was considered. The only thing I'm still not 100% understanding is, why are the positive and negative accelerations multiplied by each other? Where does that come from?
    edit: also what happens if you have a projectile launched from a lower down point which then lands on a point that's higher, I'm assuming the overall gravitational acceleration will still be negative?

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  Місяць тому

      1. The negative and positive value for acceleration comes from the fact that they are first moving up and then down. So as they are moving in different directions they SHOULD have different signs, roght? that's why
      2. Multiplying them was a visual way of showing why when we have two signs overall we take the negative. it's not explained well in the book
      3. if we start from a lower point and end at a higher point we will follow the same formulas as the opposite.
      anything else?

    • @shadowscythes
      @shadowscythes Місяць тому

      @@ThatPhysicsGuy Wow thanks for the quick reply, wasn't expecting one so soon 😂I think I understand it now, much appreciated
      My textbook and professor were both messing me up with how they were seemingly interchanging the positive/negative numbers for acceleration instead of setting down as positive, so your explanation in the video helped a lot

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  Місяць тому +1

      trying to reply faster

  • @hashaamkhan-fv6ti
    @hashaamkhan-fv6ti 8 днів тому

    when are you going to upload video's for other chapters as my midterms are approaching your lectures can help me a lot

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  8 днів тому +1

      my day job is taking all my time, so i will upload videos but it might be a month.

    • @hashaamkhan-fv6ti
      @hashaamkhan-fv6ti 7 днів тому

      @@ThatPhysicsGuy sir you can do livestreams as it would not require editing by this lecture I can see how much effort you put in to the editing

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  6 днів тому +1

      livestreams are a good idea. i will look into it later then! thanks!

  • @sunshine-ui4hu
    @sunshine-ui4hu 15 днів тому

    Please make As videoss on Moments, waves, electricity. And how to crack As past paper.

  • @Afumi_D_Afi-dq3go
    @Afumi_D_Afi-dq3go 2 місяці тому

    Plz Make Video On Circular Motion And Other Important And Tough Topic .

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  2 місяці тому

      working on it!!

    • @Afumi_D_Afi-dq3go
      @Afumi_D_Afi-dq3go 2 місяці тому

      @@ThatPhysicsGuy Thank You Very Much It Helped For My Preperation Very Much
      Good Work Sir Keep It Up🖤🖤

  • @angizapainda2499
    @angizapainda2499 Місяць тому

    Awesome, thanks ❤

  • @rickkybobbeh
    @rickkybobbeh Місяць тому

    YOU ARE AMAZINGGGGGGGGGGGG

  • @AadhiVedant
    @AadhiVedant 2 місяці тому +1

    Can you make video on current electricity problems

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  2 місяці тому

      i am working on materials, then i will go there!

  • @Srthropodano
    @Srthropodano Місяць тому

    How can you think of these equations when solving a problem? is it just because you’re familiar with them or what?thx ❤️

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  Місяць тому

      just use the 4 formulas. that's all! and yes i had the 4 suvat equations memorized

  • @priyamgosaliya3299
    @priyamgosaliya3299 Місяць тому

    I am still confused that how did you manage to explain this easily and this quickly without any creation of doubts and confusion.

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  Місяць тому +1

      many people can still be confused, it's ok.
      if needed i will comment and explain them!

    • @priyamgosaliya3299
      @priyamgosaliya3299 Місяць тому

      @@ThatPhysicsGuy There were many questions about projectile on my paper and I could attempt all confidently just because of your video. Thank you soo much

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  Місяць тому +1

      best compliment ever!

  • @WuraolamiAkerele
    @WuraolamiAkerele 12 днів тому

    pls do a video on upthrust
    thank uu❤❤❤❤😍😍😍😍😍😍

  • @Doobedobap
    @Doobedobap Місяць тому

    Thank you so much

  • @SameerSameer-hb1xc
    @SameerSameer-hb1xc 2 місяці тому +1

    Nice

  • @OptimisticPhoenix-zh3xj
    @OptimisticPhoenix-zh3xj Місяць тому

    Pls can u do the same for condition of collision of relative motion?
    The video was amazing btw❤

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  Місяць тому

      as in momentum topic?

    • @OptimisticPhoenix-zh3xj
      @OptimisticPhoenix-zh3xj Місяць тому

      @@ThatPhysicsGuy No it doesn't involve momentum...
      It's a topic of relative motion where we remove the minimum separation between the objects or the time after which they'll collide kinda stuff...
      It comes in kinematics.

  • @Suraj_Prasad_99
    @Suraj_Prasad_99 Місяць тому +1

    Make a video on circular motion

  • @someoneinbetween
    @someoneinbetween Місяць тому

    Best video

  • @rudra.patel.001
    @rudra.patel.001 Місяць тому

    THE GOAT

  • @niaaniaa5914
    @niaaniaa5914 Місяць тому

    suppose in a projectile (which ends at diff height) we are asked to find the time taken to reach max height and also the time taken to reach the ground. If we
    use 'S' as positive while calculating time for max height then do we need to use 'S' as negative while calculating time taken to reach ground.

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  Місяць тому

      exactly. different directions will need different signs!

  • @Quantumaffinity
    @Quantumaffinity Місяць тому

    Please make videos on the topics of 11th class

  • @Hexiiboii
    @Hexiiboii 2 місяці тому

    Bro can we cross out the two "t" in the last equation. [4:18] . And we'll just left with (s= v-u) but that wouldn't be correct 😢 I think you missed out something. I guess it might be the number 2 at the denominator in place of "t" 🥺.
    But overall, this is the best video I have come across. 😊❤

    • @Hexiiboii
      @Hexiiboii 2 місяці тому

      Sorry correction. S=(v+u)

    • @ThatPhysicsGuy
      @ThatPhysicsGuy  2 місяці тому +1

      hey! some commenters, including you, have pointed this out my mistake. i have to pin the comment maybe so that everyone sees it.
      the correct formula is s = { (v+u)/2 }÷t