A man fires a bullet of mass 200 g at a ...

A man fires a bullet of mass 200 g at a speed of 5 `m //s` . The gun is of one kg mass. by what velocity the gun rebounds backwards

A

`1 m//s`

B

`0.01 m//s`

C

`0.1 m//s`

D

`10 m//s`

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