Kinetic Energy

Hi there,

I am making a game in which asteriods can collide with each other. What I've been trying to figure out is how to make two asteriods, both with rigidbodies and one moving, colllide in a manner where the moving one collides with the stationary one and makes that one move, using a system similar to kinetics in the real world, sort of like newton's second law of motion. I've been pondering about and experimenting with it for about a week now, and have gotten absolutely nowhere. I don't want this to be scripted, either. Any ideas?

Here is a diagram: