If 2 billiard balls are the same exact mass, and one hits another stationary one head on, What happens to the velocities of the two balls after the collision?
1) Both balls will have the same final velocity
2) The hitting ball will stop completely and the hit ball will continue with the original velocity
3) The hitting ball will continue with the original velocity and the hit ball will stop completely
4) The velocities of both balls will change, but it is impossible to determine the exact final velocities