Two masses m and 2m are placed in fixed ...

Two masses m and `2m` are placed in fixed horizontal circular smooth hollow tube of radius r as shown. The mass m is moving with speed u and the mass `2m` is stationary. After their first collision, the time elapsed for next collision. (coefficient of restituation `e = 1//2` )

`(2pi r)/u`

`(4pi r)/u`

`(3pi r)/u`

`(12pi r)/u`

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