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A machine gun is mounted on a $2000 \mathrm{~kg}$ car on a horizontal frictionless surface. At some instant the gun fires bullets of mass $10 \mathrm{gm}$ with a velocity of $500 \mathrm{~m} / \mathrm{sec}$ with respect to the car. The number of bullets fired per second is ten. The average thrust on the system is
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$50 \mathrm{~N}$
$\mathrm{F}=\mathrm{mnV}$ where $\mathrm{n}$ is the no of bullets fired per sec
$\therefore \mathrm{F}=\left(10 \times 10^{-3}\right) \times 10 \times 500=50 \mathrm{~N}$
$\therefore \mathrm{F}=\left(10 \times 10^{-3}\right) \times 10 \times 500=50 \mathrm{~N}$
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