[CrazyEyez]

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Edit:In the brief time between when you release the ball and when the ball hits the wall, you travel in the -x direction.

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Thats not true, unless you are standing on roller skates or something. When you throw the ball in the +x direction you do not have any momentum in the -x direction because that momentum is absorbed by the friction between your feet and whatever you are standing on.

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You're close, but you need to take one more step to get there. [img]/images/graemlins/smile.gif[/img]

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Friction keeps your feet from moving on the board but that energy is transferred down to the wheels and, since perfect bearings, the board moves backward. (Then it stops when the ball hits the wall.)
Right?