Momentum and Impulse 2. Your favorite rifle (22 caliber) has a mass of 3.0 kg, a 40 cm long barrel and weigh 2.6 g (a) Before you fire the rifle, how much momentum does the bullet have? (Not a trick question, I hope) (b) Before firing, what is the momentum of the rifle? (c) The bullet is fired with a velocity of 370 m/s. What is the bullet’s momentum? (d) With what velocity does the rifle move backwards (Le. recoil)? you need to calculate both. (e) Which has more kinetic energy, the bullet or the rifle? Yes