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1. The problem statement, all variables and given/known data

My book defines the coefficient of restitution as

[tex]\epsilon = \frac{|v_2-v_1|}{|u_2-u_1|}[/tex]

but does not really explain what u_1, u_2, v_1, and v_2 mean. Those terms are all scalars since the coefficient of restitution only "works" in one direction. But do they mean the difference between themagnitudesof the initial and final velocities? I am asking whether those terms can be negative depending on the direction the particles are moving after the collisions.

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Coefficient of restitution definition

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