A gunman gets a jerk on firing a bullet.why??

when a gunman fires a bullet from his guin, he gets a jerk towards backwards on firing the bullet. this is because when the bullet is fired from the gun, it moves forwards and exerts a force on the gun; an equal amount of gorce is exerted on the bullet by the gun. this is because according to third law of motion, when a force is applied ona body, the body exerts an equal and opposite force on the another body. thus, the gun moves backwards and the gunman gets a jerk.

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