mechanics projectiles question Watch

Bertybassett
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Hi, for 12 b on this paper, can you assume that v=0 in the horizontal and vertical plane at the point where the ball is at its maximum distance above the ground? I am confused by this as how could it be stationary in the air if its constantly moving? Also, how do you do 12c ? Many thanks https://crashmaths.com/wp-content/up...RONZE-P3-A.pdf
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mqb2766
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For b) the horizontal and vertical motions are analyzed independently.
For c) you have a time and distance, what is the problem with finding the speed?
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Bertybassett
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what do you mean for a?
(Original post by mqb2766)
For b) the horizontal and vertical motions are analyzed independently.
For c) you have a time and distance, what is the problem with finding the speed?
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mqb2766
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I don't understand what you're asking.
(Original post by Bertybassett)
what do you mean for a?
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Bertybassett
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I mean what do you mean by theyre analysed independently? do you just mean you set v=0 for both?
(Original post by mqb2766)
I don't understand what you're asking.
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mqb2766
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At its highest point, the vertical component of the velocity is zero. It is independent of how fast it is moving horizontally.
The key thing about questions like these is to analyse the horizontal and vertical components separately.
(Original post by Bertybassett)
I mean what do you mean by theyre analysed independently? do you just mean you set v=0 for both?
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Bertybassett
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but is its horizontal component also v=0
(Original post by mqb2766)
At its highest point, the vertical component of the velocity is zero. It is independent of how fast it is moving horizontally.
The key thing about questions like these is to analyse the horizontal and vertical components separately.
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RDKGames
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(Original post by Bertybassett)
Hi, for 12 b on this paper, can you assume that v=0 in the horizontal and vertical plane at the point where the ball is at its maximum distance above the ground? I am confused by this as how could it be stationary in the air if its constantly moving? Also, how do you do 12c ? Many thanks https://crashmaths.com/wp-content/up...RONZE-P3-A.pdf
(Original post by Bertybassett)
but is its horizontal component also v=0
Yes it is constantly moving, but at its highest point it is moving ONLY due to the horizontal component which is *not* zero!

Only the vertical component is zero at the highest point, I don't know why you think that the horizontal component is zero as well. It doesn't make sense for it to be. Besides, when the projectile is initially launched it has a horizontal component for the velocity but at no point is the particle affected by horizontal acceleration therefore that horizontal velocity never increases/decreases.... it stays constant throughout motion, hence never zero!
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mqb2766
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No.
There are no forces in the horizontal direction, hence no acceleration or deceleration. The horizontal velocity remains constant throughout the motion. It is independent of the vertical motion.
(Original post by Bertybassett)
but is its horizontal component also v=0
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AlexT-S
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This video really helped me with projectile motion.
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