Im stuck and my teacher hates my guts

imagine two billiard balls on a pool table. ball a has a mass of 2 kilograms and ball b has a mass of 3 kilograms. the initial velocity of ball a is 9 meters per second to the right, and the initial velocity of the ball b is 6 meters per second to the left. the final velocity of ball a is 9 meters per second to the left, while the final velocity of ball b is 6 meters per second to the right.
1. explain what happens to each ball after the collision. why do you think this occurs? which of newton’s laws does this represent?

2. what can you say about the total momentum before and after the collision?

3. what do you think would happen to the velocity of each ball after the collision if the masses and initial velocities of each ball were the same?