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A ball P is moving with a certain veloci...

A ball P is moving with a certain velocity `v`, collides head-on with another ball Q of same mass at rest. The coefficient of restitution is 1/4, then ratio of velocity of P and Q just after the collision is

A

`3/5`

B

`4/5`

C

`3/4`

D

`1/4`

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