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A block having mass m collides with an a...

A block having mass m collides with an another stationary block having mass 2m. The lighter block comes to rest after collision. If the velocity of first block is v, then the value is coefficient of restitution will must be

A

`0.25`

B

`0.8`

C

`0.5`

D

`0.4`

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The correct Answer is:
A
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