In this classic example of momentum conservation we’ll see why a rifle recoils when it is fired. A marksman holds a 3.00 kg rifle loosely, so that we can ignore any horizontal external forces acting on the rifle–bullet system. He fires a bullet of mass 5.00 g horizontally with a speed vbullet=300m/s . What is the recoil speed vrifle of the rifle? What are the final kinetic energies of the bullet and the rifle?
Question:
The same rifle fires a bullet with mass 7.7 g at the same speed as before. For the same idealized model, find the ratio of the final kinetic energies of the bullet and rifle.
