Question

A gun weighing 10 kg fires a bullet of 30 gm with a velocity of 330 m/s. With what velocity
does the gun recoil. What is the resultant momentum of the gun and the bullet before and
after firing​

Answer 1

Step-by-step explanation

Momentum of the bullet equals the momentum of the gun.

Momentum equals to :

Mass × Velocity

We substitute into the formulae and get :

0.03 × 330 = 10 × V

9.9 = 10V

V = 0.99 m/s

Momentum before firing is zero since both the gun and the bullet are at rest and their velocities are zero.

Momentum after firing is equal to momentum of the gun plus the momentum of the bullet which are equal and opposite.

This is therefore :

330 × 0.03 × 2 = 19.8Kgm/s