Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsReactive Collision Dynamics in Two Dimensionshttp://demonstrations.wolfram.com/ReactiveCollisionDynamicsInTwoDimensions/]]>http://demonstrations.wolfram.com/ReactiveCollisionDynamicsInTwoDimensions/