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A ball kept at a height of 5m,, is allow...

A ball kept at a height of 5m,, is allowed to tall freely. It hits the ground. The coefficient of restitution is 0.6. What is the time interval between the first and second rebound? (`g=10m//s^(2)`)

A

1s

B

1.1s

C

1.2s

D

1.5s

Text Solution

Verified by Experts

The correct Answer is:
C
There is an inelastic collision between A and B .
By using the principle of conservation of linear momentum, we get
`m_1 u_1 +m_2 u_2 =(m_1 +m_2)` v
`therefore 5 xx 4 + 4(-5) = (4xx5)v`
`therefore 20-20 =9v therefore 9v =0 therefore v=0`
`therefore ` The velocity of the combined mass after collision is zero.
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