Examkrackers Physics Collision Graph

[Wintergirl05]

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I'm having trouble understanding the collision stuff. On pg 56 of EK Physics Lec 4 they have a graph and I'm kind of confused. I know it is not necessary to know it but when I do the 1001 problems they refer back to the graph for the explanations and I would like to at least understand how to read it.

Can someone explain how to read the graph and if possible write out the possible trends for the different collisions?

 

[Erythropoietin]

I'm having trouble understanding the collision stuff. On pg 56 of EK Physics Lec 4 they have a graph and I'm kind of confused. I know it is not necessary to know it but when I do the 1001 problems they refer back to the graph for the explanations and I would like to at least understand how to read it.

Can someone explain how to read the graph and if possible write out the possible trends for the different collisions?

Yeah that's very confusing and even EK says that it won't be on the mcat.
Just know the m1v1 = m2v2 formula and how it differs for inelastic and elastic collisions. EK 1001 gives a lot of problems involving that formula.