Question

a ball is thrown upward. what is its time interval between the release of the ball and the time it reaches its maximum height? the acceleration of gravity is 9.8 m/s2 and the maximum height is 3.6m. answer in s

Answer 1

Use the following eqs respectively to obtain time t
1) v^2(final) - v^2(initial)=-2gh, (h=3.6m)
2) v(final) = -gt + v(initial)

according to the fact that the final velocity of the particle would be zero at its maximum height, you can find its initial velocity. Then put initial velocity into eq 2 to obtain time t.

Answer 2

how do you find the initial velocity?

Answer 3

You can simply do by eq1, since final velocity is zero there.

Answer 4

how do you know what equation to use if you are trying to figure out a problem that uses velocity?

Answer 5

It mostly depends upon how much you do exercise everyday. Pick up several problems and try to solve them.

Answer 6

thanks!

Answer 7

Anytime.