9 Dec
2010
9 Dec
'10
8:49 p.m.
If you only have a single additional ball (i.e. the heavy ball and one normal ball), then I believe the normal ball should move off at (4/3)v, while the heavier ball continues moving in the same direction at (1/3)v. When you add additional balls it becomes more complex. If there were some distance between the balls it would be simpler, but because they're touching, the secondary collisions are happening almost instantaneously, making it much more sensitive to any imperfections that might affect the timing. Tom