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up to you really, depends on the type of elastic band you get, you may have to run a few tests see if you can actually get the car to run the distance required. I suggest that it be as light as possible though, unless you have trouble with the car going to far, they you could weigh it down a little.

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Setting length of travel is easy: string + axle. The hard part is the power source. Friction is your enemy. Hooke's law for the rubber bands, then energy equals force times distance. You'll need some clever leverage to convert short and large to long and easy.

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