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Questions  

A particle of mass m moving with speed v hits elastically another stationary particle of mass 2m inside a smooth horizontal circular tube of mean radius r. The time after which the second collision will take place is

a
2πrv
b
4πrv
c
3πr2v
d
πrv

detailed solution

Correct option is A

In elastic collision, relative speed of separation = relative speed of approach = v∴  Time of next collision =2πrv

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