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A Neutron moving with velocity v collide...

A Neutron moving with velocity v collides with a stationary `alpha` particle. The velocity of the neutron after collision is

A

(A) `-3v//5`

B

(B) `3V//5`

C

(C) `2V//5`

D

(D) `-2V//5`

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The correct Answer is:
A
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