A machine gun of mass 10 kg fires 20 g bullets at the rate of 180 bullets per minute with a speed of 100 ms^-1 each. The recoil velocity of the gun is

Conserving momentum,
$\frac{180\times 20\times {10}^{-3}\left(100\right)}{60}=10\times \mathrm{v}$
So, v = 0.6 m/s
$3\times 20\times {10}^{-3}\times 100=10\mathrm{v}\mathrm{v}=\frac{6}{10}=0.6$
true sol: the gun imparts $\frac{180}{60}\times 20\times {10}^3\left(100\right)=6 \mathrm{kgm}/\mathrm{s}$ momentum per second.
So, the coil force is   and gun velocity keeps increasing. Question is wrong