Physics - W.E.P. Question with Solution | TestHub

Work done by the gun $=$ total kinetic energy of the bullets $$\begin{array}{rl}& =n\frac{1}{2}m{v}^2=300\times \frac{1}{2}\times 10\times 10^{-3}\times (600{)}^2\\ & =150\times 10\times 10^{-3}\times 600\times 600\end{array}$$ $$\begin{array}{rl}\text{ Power of gun }& =\frac{\text{ work done }}{\text{ Time taken }}\\ & =\frac{150\times 10\times 10^{-3}\times 600\times 600}{60\mathrm{s}}\\ & =9\mathrm{kW}(\because 1\text{ minute }=60\text{ seconds })\end{array}$$