Kurt, this is an awesome comment and I really appreciate this! I remember being called a goat last year by another student and I was very confused 😂 Luckily I now know what it means! Wishing you all the best for 2021!
Sir this was simply amazing. I was struggling with a similar question and after watching this a second time its like the question just opened up. Amazing. Thank you so much
Thank you Kevin this really helped ! So let's ball B was projected upwards from the same position as ball A do you have to use this method to find the time or do you use a totally different method?
Good question Shipongani! We would be able to say that the displacement of A and B would be the same at the time of B passing A. XA = XB and then you could do a similar approach.
Great Video Kevin but I understood the question in this way since we took down as positive it means that the displacement for Ball A will be positive and the displacement for Ball B will be negative and instead of changing the direction we have chosen we can simply write the equation like this Distance A+(-(Distance B))=50
Karabo I would suggest watching the video a few more times so you can try get a very good understanding of what we did here. It is a challenging question. None of the objects moved 50m. Together they covered 50m.
Ball A moves downwards (it might jump up after contact with the ground but that is irrelevant to the question)... so you choose down as positive to get a positive answer for displacement Ball B moves upwards and later on downwards (downwards also doesn't matter in this situation). you thus choose up as positive to get a positive displacement for B when it is next to A the whole idea of the 2 directions is to make the equation: Displacement A + Displacement B = 50 meters if you chose one of the balls movement to be in such a way where it's displacement is positive and the other one is negative that equation won't work. check from 2:10-4:20 . He explains there...any other questions just lmk
Hi Kevin😊I have a question. How do you know that ball B travels less than 50m, because it was projected upwards, it could even go higher than the 50m building. So with what proof are you saying that. Displacement A+ Displacement B= 50m ? Im really curious 😊Hoping to hear soon.
Good question, ball B can actually go more than 50m. But we are only referring to when they REACH each other. At that point, the displacement of A + displacement of B would have to be 50 because together, they have covered the length of the building.
Hi...soo...when we choose a direction for these kinna sums...y dont we just take initial direction as possitive...and anything in the opposite motion to be negative
I was also stuck with question but now i understand. If you try calculate how long it takes ball A to reach 25m, you’ll find that the answer is 2.25 seconds, and if you calculate how long it takes for ball B to reach 25m, you’ll find the answer to be 0.9 seconds. This basically means that although the balls reach 25m, they don’t reach that point at the same time. But our question is basically asking, “at what time will the balls pass each other”. So the distance when they pass each other doesn’t have to be the same but the time will be same. So ball A will take 1.2s to reach the hypothetical distance of 30m and ball B will take 1,2s to reach the hypothetical distance of 20m. This is where they will pass each other. (Try plotting a graph like maybe a parabola with time on the x and distance on the y, and see what it looks like) @SithembileMgabhi-tu2pw i hope this helps🤍 and @Kevinmathscience or anyone else please correct me if I’m wrong.
Kevin you the undisputed goat, everyone should know about you.
Kurt, this is an awesome comment and I really appreciate this!
I remember being called a goat last year by another student and I was very confused 😂 Luckily I now know what it means!
Wishing you all the best for 2021!
Like my comment if you're watching this the day before your exam/test
Day before? Bro my paper is in less than 4 hours
Sir this was simply amazing. I was struggling with a similar question and after watching this a second time its like the question just opened up. Amazing. Thank you so much
Naomi, I have so happy you had a breakthrough.
Never give up when you get stuck. Rather keep trying until you get it.
All the best for this year!
Can you please help me
How do you identify or know which position each ball has started
2 years later, still the goat
Goat himself let him cook. 🔥🔥😤
even after 3 years you're still a G.O A.T❤ thank you Kevin.
This playlist was helpful thank you sir ❤
This Is marvellous ❤.Thank You Sir !!
It was to easyyy to understand 🎉😊😮
the answer is actually 1.3 second, round it off, 1.25.
This was very helpful ❤️💯your a life saver Kevin!!!
Glad it was helpful!😁
How is it possible to choose two different directions as positive? Don't you have to stick with one direction the whole time?
you chose different directions for each of the of ball A and ball B 'do you consider hem balls as two different systems???
Thank you Kevin this really helped !
So let's ball B was projected upwards from the same position as ball A do you have to use this method to find the time or do you use a totally different method?
Good question Shipongani! We would be able to say that the displacement of A and B would be the same at the time of B passing A.
XA = XB and then you could do a similar approach.
I feel like im a genius all thanks to uu✌🏽
Great Video Kevin but I understood the question in this way since we took down as positive it means that the displacement for Ball A will be positive and the displacement for Ball B will be negative and instead of changing the direction we have chosen we can simply
write the equation like this Distance A+(-(Distance B))=50
Thank u so much for this explanation it really helped.🌟
You’re a star
How do you know or identify the positions each ball has started
Please help
kevin can it be possible for ball a to reach 40 m and ball b to reach 10 m to sum up the building to be 50 m
Thanks ☺️...but what about vertical projectile motion represented in graphs?
Hi Danson, yes I may upload those soon.
Kevin do you have a video for electrodynamics and photoelectric effect 😭
U really are the G.O.A.T🇿🇦🔥
please can you do a video on vertical projectile motion graphs :)
Nizam, will do my best :)
Can you plzz do higher order qustions on vertical vertical projectile
Please check my playlist as there are some good ones there already :)
Here:
ua-cam.com/play/PLU_DCVXL8MyNxb2NhBwyses8BlX-DBv_t.html
Hey Kevin , why didn't you substitute the 50m into the 🔺❌ ?
Karabo I would suggest watching the video a few more times so you can try get a very good understanding of what we did here.
It is a challenging question.
None of the objects moved 50m. Together they covered 50m.
Sir may you please do VPM graph
Hey Mr Kevin, i just want to ask, is this the only way to do it?
How did u know whicj ball sgould choose down and positive and which one up and why do we have 2 different directions
Ball A moves downwards (it might jump up after contact with the ground but that is irrelevant to the question)... so you choose down as positive to get a positive answer for displacement
Ball B moves upwards and later on downwards (downwards also doesn't matter in this situation). you thus choose up as positive to get a positive displacement for B when it is next to A
the whole idea of the 2 directions is to make the equation: Displacement A + Displacement B = 50 meters
if you chose one of the balls movement to be in such a way where it's displacement is positive and the other one is negative that equation won't work.
check from 2:10-4:20 . He explains there...any other questions just lmk
thanks bro really helped a lot
Kevin how did you know that B Will end higher that where it starts
Thanks from Matriek 2024
Hi Kevin😊I have a question.
How do you know that ball B travels less than 50m, because it was projected upwards, it could even go higher than the 50m building. So with what proof are you saying that. Displacement A+ Displacement B= 50m ?
Im really curious 😊Hoping to hear soon.
Good question, ball B can actually go more than 50m. But we are only referring to when they REACH each other.
At that point, the displacement of A + displacement of B would have to be 50 because together, they have covered the length of the building.
Sir you've helped soo far all that's left is projectile graphs, could you please make a video about them 🙏
Will do my best Noyaya! :)
Hey kev how much would tutor a whole school for, for a single day?
I used a second method, but the answer was close to yours, and I got t=1, 1seconds is still right?
Hi sir, I have a question, what if I choose for ball A ⬆as + and for ball B ⬇ as + ....is that okay?
I tried that the answer was negative and it's wrong
How do we know that it must give us 50?
Hi...soo...when we choose a direction for these kinna sums...y dont we just take initial direction as possitive...and anything in the opposite motion to be negative
You could do that as well. Many learners prefer this approach.
Hi Kevin 😊hope you well..
I still don't understand why the two balls won't travel 25m and 25m
I was also stuck with question but now i understand. If you try calculate how long it takes ball A to reach 25m, you’ll find that the answer is 2.25 seconds, and if you calculate how long it takes for ball B to reach 25m, you’ll find the answer to be 0.9 seconds. This basically means that although the balls reach 25m, they don’t reach that point at the same time. But our question is basically asking, “at what time will the balls pass each other”. So the distance when they pass each other doesn’t have to be the same but the time will be same. So ball A will take 1.2s to reach the hypothetical distance of 30m and ball B will take 1,2s to reach the hypothetical distance of 20m. This is where they will pass each other. (Try plotting a graph like maybe a parabola with time on the x and distance on the y, and see what it looks like) @SithembileMgabhi-tu2pw i hope this helps🤍 and @Kevinmathscience or anyone else please correct me if I’m wrong.
@nombusoncube7040 hii please help
How do you know which position each ball has started at
But guys 40/50=0.8 ......why kelvin....mara fede thaa
the most difficult one
Hope you understand it!