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A small uniform solid sphere A rolls dow...

A small uniform solid sphere A rolls down a fixed surface starting at a height h and collides elastically with a sphere B which is identical in size to A but has twice its mass. The speed of the sphere B, just after the collision is

A

`(sqrt(2gh))/(3)`

B

`(2sqrt(2gh))/(3)`

C

`(sqrt(10gh))/(63)`

D

`(sqrt(40gh))/(63)`

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The correct Answer is:
D
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