Two perfectly elastic particles A and B ...

Two perfectly elastic particles `A` and `B` of equal masses travelling along a line joining them with velocities `15 m//s` and `10m//s` respectively collide. Their velocities after the elastic collision will be (in m/s) respectively

A

`10 "m s"^(-1) ,15" m s"^(-1)`

B

`20 "m s"^(-1) ,5" m s"^(-1)`

C

`0 "m s"^(-1) ,25" m s"^(-1)`

D

`5 "m s"^(-1) ,20" m s"^(-1)`

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A

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