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Question

A ball kept at a height of 5m, is allowed to fall freely. It hits the ground. The coefficient of restitution is 0.6 What is the time interval between the first nd second rebound?(g=10m/s2)

A
1s
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B
1.1s
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C
1.25s
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D
1.5s
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Solution

The correct option is C 1.25s

Let u be the velocity of striking.
e=6.0
uBgf=e
uBgf=0.6×10
uBgf=6m/s
uBgi=2×5×g
uBgi=10m/s
Time taken for second rebound
0=6t12gt2
0=t(65t)
t=1.25


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