A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100 ms¯¹. The recoil speed of the machine gun is

A. 0.5 ms⁻¹
B. 1.5 ms⁻¹
C. 1 ms⁻¹
D. 2 ms⁻¹

Correct Answer:

Option C = 1 ms⁻¹

Explanation

Gun Momentum = bullet momentum

MaVa = MbVb
5 x Va = 0.05 x 100

Va = 1m−1