Coefficient of Restitution? PLEASE HELP!!! 1. The problem statement, all variables and given/known data Two balls of equal mass moving with the speed of 3 m/s, collide head on. Find the speed of each after impact if the coefficient of restitution is 1/3. 2. Relevant equations e=(v2-v1)/(u1-u2) v2= velocity after impact of object 2 v1= velocity after impact of object 1 u2= velocity before impact of object 2 u1= velocity before impact of object 1 3. The attempt at a solution I put the numbers into the equation and it yield 0 over something. The answer is 1 m/s for both ball, but with that into the equation, it would yield 0/0. My book doesn't say anything on how to do this problem. Maybe it is as simple as multiplying the velocities by 1/3 to get the answer. Could someone please help me out?