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.
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 Mentor Blog Entries: 1 Since the balls approach each other, one has a velocity of +3 m/s while the other has a velocity of -3 m/s.
 yes that is true, but i just copied the problem exactly from the book.

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