Physics

Problem

A bullet of mass 20g has an initial speed of

1 \text{ ms}^{-1}

, just before it starts penetrating a mud wall of thickness 20 cm. If the wall offers a mean resistance of

2.5 \times 10^{-2} \text{ N}

, the speed of the bullet after emerging from the other side of the wall is close to : a.

0.1 \text{ ms}^{-1}

0.7 \text{ ms}^{-1}

0.3 \text{ ms}^{-1}

0.4 \text{ ms}^{-1}