In a game of billiards, a red billiard ball is traveling in the positive x-direction with speed v and the cue ball is traveling in the negative x-direction with speed 3v when the two balls collide head on. Which statement is true concerning their velocities subsequent to the collision? Neglect any effects of spin.
1)red ball: -v; cue ball: 3v
2)red ball: v; cue ball: 2v
3)red ball: -3v; cue ball: v
4)red ball: v; cue ball: 3v
5)The velocities can't be determined without knowing the mass of each ball