Question

A tennis ball hits vertically upward with the velocity of 25ms−1 and takes 4 s to reach the highest point. The maximum height reached by the ball is 45 m
55 m
30 m
50 m

Answer 1

Explanation:

When the ball reaches the highest point, its velocity will be zero. So final velocity is v=0m/s

Here, the time to reach highest point is equal to time to hit ground from highest point.

Consider upward motion, the acceleration of the ball is a=−g=−9.8m/s

2

(minus for motion opposite to gravity)

If t be the required time.

Using v=u+at,

0=25+(−9.8)t

⟹ t=2.5s

Thus the ball hits the ground after 2.5 seconds after reaching its highest point.

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