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A man fires a bullet of mass 20 g at a s...

A man fires a bullet of mass 20 g at a speed of `5 ms^(-1)`. The gun is of 1 kg mass. With what velocity, the gun rebounds backward ?

A

`0.1 m s^(-1)`

B

`10 m s^(-1)`

C

`1 m s^(-1)`

D

`0.01 m s^(-1)`

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