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A sphere of mass 8m collides elastically...

A sphere of mass `8m` collides elastically (in one dimension) with a block of mass `2m`. If the initial energy of sphere is E. What is the final energy of sphere?

A

`0.8 E`

B

`0.36 E`

C

`0.08 E`

D

`0.64 E`

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