First slide
Vertical projection from ground
Question

A ball is thrown vertically upwards from the ground with a speed of 25.2 ms-1. How long does it take to reach its highest point and how high does it rise? (Take, g = 9.8 ms-2)   

Moderate
Solution

Given, upward velocity of ball = 25.2 ms-1

Height attained by the ball,

                              H=u22g=25.2×25.22×9.8=32.4 m

Now, time taken by the ball to attain 32.4 m is

                             t=ug=25.29.8=2.57 s

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