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Q.
If a machine gun fires $n$ bullets per second each with kinetic energy $K$, then the power of the machine gun is
Work, Energy and Power
Solution:
Power $=\frac{\text { total work done }}{\text { time }}$
$=\frac{\frac{1}{2} M v^2}{t}=\frac{1}{2}\left(m v^2\right) n\left(\because \frac{M}{t}=m n\right)$
$= kn \left[\because KE K=\frac{1}{2} mv ^2\right]$