a ball is thrown vertically into the air with an initial velocity of 20m/s. Find

Question

a ball is thrown vertically into the air with an initial velocity of 20m/s. Find the maximum height of the ball and find the amount of time to reach the maximum height. a ball is thrown vertically into the air with an initial velocity of 20m/s. Find the maximum height of the ball and find the amount of time to reach the maximum height. a ball is thrown vertically into the air with an initial velocity of 20m/s. Find the maximum height of the ball and find the amount of time to reach the maximum height.

Explanation / Answer

a) the maximum height of the ball is

v^2 = u^2 - 2gs

or, s = u^2/2g = 20^2/2x10 = 20 m [final velocity v=0 and taking g= 10 m/s^2]

b) the amount of time to reach the maximu height

v = u - gt

or, t = u/g [as final velocity v=0 at top point]

or, t = 20/10 = 2 s

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