Explain the firing by a gun.

Explain the firing by a gun.

When a person fires with a gun, he feels a backward push at that time. In this case, action and reaction force of bullet and gun exists for the same time. According to Newton's second law of motion, the bullet and the gun acquire equal and opposite momentum. As a result the bullet moves forward with a particular momentum and the gun moves backward with a momentum of same magnitude but opposite in direction. Due to this the person will feel a backward thrust. The backward velocity of the gun will be smaller in comparison to that of the bullet as the mass of the gun is grater.