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Particle 'A' moves with speed 10m//s in ...

Particle 'A' moves with speed `10m//s` in a frictionless circular fixed horizontal pipe of radius 5m and strikes with 'B' of double mass that of A. Coefficient of restitution is `1/2` and particle 'A' -starts its journey at t=0. The time at which second collision occurs is:

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