Question

Abullet of mass 100g fired from a gun of mass of 2 kg
with velocity of 150 m/s Calculate the recoil vel of
gun (2)​

Answer 1

Answer:conservation of momentum.

We know

Momentum = mass X velocity

Thus, we can say:

Momentum before gun is fired = momentum of gun after firing + momentum of bullet after firing

If we consider recoil velocity of gun as V m/s. and units will be 100g = 0.1 kg

By conservation of momentum:

 (2kg + 0.1 kg) X 0 m/s = (2kg X V m/s) + (0.1 kg X 150 m/s)

 =>0 = 2V + 15

 =>V = -7.5 m/s

 So the velocity of recoil is -7.5 m/s and the minus sign states that the gun recoils in the opposite direction to the direction of the bullet

Explanation: By conservation of momentum..