1. Distinguish between an elastic collision and an inelastic collision. For which type of collision is momentum conserved? 2. Railroad car A rolls at a certain speed and collides elastically with car...

1. Distinguish between an elastic collision and an inelastic collision. For which type of collision is momentum conserved?

2. Railroad car A rolls at a certain speed and collides elastically with car B of the same mass. After the collision, car A is at rest. How does the speed of B after the collision compare with the initial speed of A?