Question

a machine gun fires 240 bullets per minute ,each bullet travelled with a velocity of 500 mass of each bullet is 5×^-3 find the power if machine gun

Answer 1

Kinetic energy of each bullet is
$\frac{1}{2}m{v}^2=\frac{1}{2}\times 5\times {10}^{-3}\times (500{)}^2=\frac{1}{2}\times 5\times 250$
So in one minute total workedone is $240\times \frac{1}{2}\times 5\times 250$
So power is $\frac{240\times \frac{1}{2}\times 5\times 250}{60}=2500$W