Question

A bullet of mass 20 g has an initial speed of 1 ms–1 , just before it starts penetrating a mud wall of thickness 20 cm. If the wall offers a mean resistance of 2.5 × 10–2N, the speed of the bullet after emerging from the other side of the wall is close to :

(1) 0.3 ms–1 (2) 0.1 ms–1 (3) 0.7 ms–1 (4) 0.4 ms–1

Answer 1

Correct option (3) 0.7 ms–1

Explanation:

M = 20 g

u = 1m/*

v = ?

v2 = u2 + 2as

• = 20 × 10–2 m