Non-ideal collision?

[buffgilville]

Suppose that a projectile marble and target marble do not collide with their centers of mass equidistant from the floor. What problems in analyzing this experiment are caused by this non-ideal collision?

(I could not find anything on non-ideal collision in my textbook.)

[Sirus]

So basically one marble is in the air during the collision? Well, you need to take into account the vertical component of the momenta of the marbles at various points in the experiment. I think that is all.