A rifle with a mass of 2.5 kg fires a bullet with a mass of 5.5 g (0.0055 kg). The bullet moves with a muzzle velocity of 330 m/s after the rifle is fired.
(a) What is the momentum of the bullet after the rifle is fired? 826.815 kg·m/s
(b) If external forces acting on the rifle can be ignored, what is the recoil velocity of the rifle? m/s (in the opposite direction to the bullet)