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This applet illustrates elastic collisions.

The coloured discs can be dragged. The white circle represents the center-of-mass of the two discs.

Notice how the center-of-mass continues to move with constant velocity when the balls collide and accelerates only when the balls collide with the walls( which is when there is an external force on the system of the two balls ).

If your computer has a graphics card, a recent version of Google-Chrome or Firefox that supports WebGL, a 3d version of this applet can be seen here

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