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A machine gun fires n bullets per second...

A machine gun fires n bullets per second with speed u, and mass of each bullet is m. If bullets hit a wall and rebounds with same speed, then force acting on the wall is

A

`nm u `

B

`2nm u`

C

`4nm u`

D

`(nm u)/(2)`

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AAKASH INSTITUTE-LAWS OF MOTION-EXERCISE
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