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Questions  

Two marbles, A and B, lie on a smooth horizontal circular groove at opposite ends of a diameter. A is projected along the grove and at the end of time t impinges on B. The coefficient of restitution is ‘e’. The time interval between first and second collision is 

a
t
b
t/e
c
2t/e
d
2t

detailed solution

Correct option is C

Final relative velocity = -e initial relative velocity∴t1=2πrev=2te

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