Vertical Projectile Motion Grade 12: Practice

In this lesson we do a grade 12 Vertical Projectile Motion practice question.
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[@Theeboydoingthingz_67]

We use 1.70 sec for Stone B because it took Stone A , 6.7 sec to reach the ground. If we minus 5 sec (Because it was dropped 5 sec later) from that which is 1.7, that is the time B has been in the air for( free fall) waiting to hit the ground. (Hope it helped someone coz I struggled at first😅)

[@baldiola1366]

For question 3.2.3 why would the time for the hot air balloon be 1,7 seconds wasn’t the balloon was still moving before stone B was dropped and while stone A was dropping, so won’t it include those 5 seconds?

[@danielfourie4672]

smart

[@lloyd7453]

That's what I was thinking...🤔

[@vicco.6805]

Bro that what i was thinking

[@tanthrax..]

i also thought so at first but i realized the question wanted the distance between balloon and ball b so hes correct

[@ThaboDinga-br1ob]

Sir i dont understand why did you use 1.70 for the hot air ballon

[@arch_dornan6066]

12:13 the balloon is going down, not up. The initial velocity should be positive

[@Blonded.101]

sir wouldn't the time of the ballon be 5s since the ball was released at 5s so the in that 5s, the balloon should've been rising up and the 1.7s is comparison between rock B and A. when you say 1.7s for the ballon, that would mean the rock was released 1.7s later not 5?

[@marywangarikaranja3967]

in question 3.2.2 ,why did you use 1.70 as the time for the hot air balloon>?????

[@MuzwakheManzini]

I think that is because you wanna find out how long has the hot air balloon also travelled in the very same duration of 1,7s which stone B moved....

[@SentByGrim10]

@@MuzwakheManzini correct

[@anekakhali5599]

​@@MuzwakheManziniBut aren't they asking where the ball B was when ball A hits the ground and where the balloon also was in that 6.7 seconds and the difference between those distances would be the distance between the balloon and ball B?I'm so confused.

[@InamXiphu]

Why do we use 1.7 as the time for the ballon,does that mean the ballon moves after the stone hits the ground?😵‍💫

[@_candyy6536]

Okay

[@user-xj2cw4ir8r]

Why did we use 1.7 for the hot air balloon instead of 5.@kevin math's and sciences

[@raiixbon17]

beacuse sir took 5 seconds stone B away from 6,70 seconds from stone A

[@imanallie8111]

Why did u make the velocity of stone B a negative ?

[@vutomiangel9992]

Also have the same question

[@temaaadlamini]

because he chose downwards as positive

[@Hendrycandy]

Optical phenomena videos 😢 not available 💔

[@thabangmanamela-ph8sv]

it is still part of the sillabus?

[@Hendrycandy]

@@thabangmanamela-ph8sv yes❤️

[@Nobody2you772]

@@Hendrycandyhey , they’re up now I think as the photo electric effect ???idk if that’s the same thing