A particle of mass m moving with a speed...

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?

`(2 pi r)/(v)`

`(4 pi r)/(v)`

`(3 pi r)/(2v)`

`(pi r)/(v)`

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