Question

A gun fires a bullet of mass 50g with a velocity of 30m/s. Because of this, the gun is pushed back with a velocity of 1m/s. The mass of the gun is?

(a) 5.5kg

(b) 3.5kg

(c) 1.5kg

(d) 0.5kg

This question was posed to me by my school teacher while I was bunking the class.

This interesting question is from Moment of Inertia in chapter System of Particles and Rotational Motion of Engineering Physics I

Answer 1

Correct answer is (c) 1.5kg

The best explanation: By conservation of momentum, MV = mv

M = mv/V = 1.5kg.