Question

Superman is hit by 100 bullets of 40 gm each with a speed 250 m/s. These bullets are reflected back in 0.2 sec with same speed. Force exerted by these hundred bullets on superman is? Ans is 100N

Answer 1

$$\begin{gathered} \mathrm{Force}\mathrm{on}\mathrm{superman}: \\ \mathrm{F}=\frac{\mathrm{m}\left(\mathrm{v}-\mathrm{u}\right)}{\mathrm{t}} \\ =\frac{0.04\times \left[250-\left(-250\right)\right]}{0.2} \\ =100\mathrm{N} \end{gathered}$$