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A body of mass m moving with velocity u ...

A body of mass m moving with velocity u collides head on elastically with another body of mass 2m at rest. The ratio of kinetic energy of the colliding body before and after collision-is

A

`4:1`

B

`9:1`

C

`2:3`

D

`5:4`

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Verified by Experts

The correct Answer is:
B
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