A ball is dropped from a height of 20 m and rebounds with a velocity which is 3 th 4 of the velocity with which is hits the ground. What is the time interval between the first and second bounces (g = 10 m/s2 )
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Velocity after collision (v)
= 3/4 x √(2 x 10 x 20)
= 15m/s
t = 2u/g = 3sec
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