How to get velocity of object?

[korry]

Hi, is possible get velocity some object? I would use it for solve the Newton's wheel - if I know the speed of wheel (or rotations), I can channge colours to white (increasing rotations=more R,G,B, max rotations - R,G,B=1,1,1). I spent with it a few hours, but nothing.
I want to solve it for next thing -Maxwell Boltzmann distribution. If I know speed of moleculas (circles), I can change its colour and show, that molecules hasn't same velocities and If I "heat" them, there will be less slow molecules and more hot molecules.
Thanks for help.
Korry

[hiltropper]

maybe you'll get any information from this older post i wrote.http://www.algodoo.com/forum/viewtopic.php?f=13&t=3292