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Sphere A of mass 'm' moving with a constant velocity u hits another stationary sphere B of the same mass. If e is the co-efficient of restitution, then ratio of velocities of the two spheres `v_(A):v_(B)` after collision will be :

A

`(1-e)/(1+e)`

B

`(2+e)/(2-e)`

C

`((1+e)/(1-e))^(2)`

D

`((1-e)/(1+e))^(2)`

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The correct Answer is:
A
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