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A neutron travelling with a velocity v a...

A neutron travelling with a velocity `v` and kinetic energy `E` collides perfectly elastically head on with the nucleus of an atom of mass number `A` at rest. The fraction of the total kinetic energy retained by the neutron is

A

`((A-1)/(A+1))^(2)`

B

`((A+1)/(A-1))^(2)`

C

`((A-1)/(A))^(2)`

D

`((A+1)/(A))^(2)`

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The correct Answer is:
A
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