Question

A bullet the f mass 4g is fired from a gun of mass 4kg what is the recoil velocity of gun if the bullet moves with 10m/s

Answer 1

Answer:

Velocity of recoil = 0.01 m/s

Explanation:

Let's take m1 = 4 gram = 0.004 Kg

m2 = 4 kg

v1 = 10 m/s

v2 =?

According to the law of conservation of momentum,

Total momentum before firing = Total momentum after firing

(Before firing both the rifle and bullet is at rest and so Total momentum before firing is zero)

0 = m1*v1 + m2*v2

0 = 0.004*10 + 4*v2

v2 = -0.01 m/s

(Negative sign indicates that movement of rifle is opposite to bullet)