Physics- need some help?

Question

A billiard ball rolling across a table at 1.50 m/s makes a head on elastic collision with an identical ball. Find the speed of each ball after the collision (a) when the second ball is intially at rest (b) when the second ball is moving toward the first at a speed of 1.00 m/s, and (c) when the second ball is moving away from the first at a speed of 1.00 m/s.

Answer 1

a) the first ball is at rest and the second ball is moving at 1.5 m/s

b) the first ball will rebound back at .25 ms and the second ball will rebound the opposite way .75 m/s

c) both balls will move away at the same speed of 1.25 m/s