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A particle of mass `m` moving with a speed `v` hits elastically another staionary particle of mass `2m` on a smooth horizontal circular tube of radius `r`. Find the time when the next collision will take place?

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Verified by Experts

The correct Answer is:
B
Since collision is elastic. It means relative velocity of separation will remain v and relative velocity means one mass is assumed at rest.

`:. t=(2pir)/(v)`
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