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Q. A gun fires $N$ bullets per second, each of mass $m$ with velocity $v$. The force exerted by the bullets on the gun is

J & K CETJ & K CET 2008Laws of Motion

Solution:

$F=p \times t$
$ = Nm ( v - u ) t$
$= mNv$ (as $u =0,\, t =1\, s$)