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Question

A ball is projected vertically up with a speed of 50 m/s. Find the maximum height, the time to reach the maximum height, and the speed at the maximum height.
(g=10m/s2)

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Solution

Initial velocity, u=50ms1

At maximum height final velocity, v=0

Apply first kinematic equation of motion

v=u+at

0=5010t

t=5sec

Apply second kinematic equation of motion

v2u2=2as

02502=2(10)h

h=125m

Hence, at maximum height final velocity is zero, time taken 5secand maximum height is 125m


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