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A smooth sphere of mass M moving with ve...

A smooth sphere of mass M moving with velocity u directly collides elastically with another sphere of mass m at rest. After collision their final velocities are V and v respectively. The value of v is

A

`(2uM)/(m)`

B

`(2um)/(M)`

C

`(2u)/(1+(m)/(M))`

D

`(2u)/(1+(M)/(m))`

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The correct Answer is:
C
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