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From a rifle of mass 4 kg, a bullet of mass 50 g is fired with an initial velocity of 35 m s−1. Calculate the initial recoil velocity of the rifle.
Asked by Saravana Last Modified
Answer 
Shivam Sharma
Mass of the rifle, 
Mass of the bullet, 
Recoil velocity of the rifle = 
Bullet is fired with an initial velocity,
Initially, the rifle is at rest.
Thus, its initial velocity, v = 0
Total initial momentum of the rifle and bullet system 
Total momentum of the rifle and bullet system after firing:
According to the law of conservation of momentum:
Total momentum after the firing = Total momentum before the firing
The negative sign indicates that the rifle recoils backwards with a velocity of 0.4375 m/s.
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