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Two particles having masses m and 2m are...

Two particles having masses m and 2m are travelling along x-axis on a smooth surface with velocities `u_(1)` and `u_(2)`, collide. If their velocities after collision are `v_(1)` and `v_(2)`, then the ratio of velocities of their centre of mass before ans impact is

A

`2:1`

B

`2:3`

C

`1:1`

D

`1:2`

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The correct Answer is:
C
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