Please help me with physics..!

2009-02-24 11:12 pm

What is the acceleration of a projectile when its reaches its highest point? What is its acceleration just before and just after reaching this point? Explain
Is it possible for the velocity of a projectile to be at right angles to its acceleration? If so, give an example.
Thank you :) (if you could also explain the question for me )
THx alot, plz help..., please help me between this two day...

回答 (1)

Simon

2009-02-25 12:04 am

✔ 最佳答案

I assume you are a F4 student.
I assume what you are asking is about a projectile on the earth and g=10metre(m)/second(s) and there is no friction.
Based on the above assumptions, the acceleration of a projectile at its highest point, just before and just after the highest point are always 10, although the velocities are different that velocity at highest point is 0 while velocity 1s before the highest point is 10m/s upward and 1s after the highest point is 10m/s download.
It is possible for the velocity at right angle to the acceleration. Imagine you fire a bullet to the front, then the velocity is to the front while acceleration is downward due to gravitational force.

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