When a bullet is fired from a gun, the gun exerts a force on thebullet in the forward direction. This is the action force. The bullet also exerts an equal force on the gun in the backward direction. This is the reaction force. Due to the large mass of the gun, it moves only a little distance backward by giving a jerk at the shoulder of the gunman. The backward movement of the gun is called the recoil of the gun. So, due to heavy mass of the gun, it recoils with lesser speed. Hence, both the statements are individually true, but Statement II is not the correct explanation of Statement I.