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for braking purposes, imagine the only energy you could use to wind the spring was the weight of the toy car and its forward speed. Without all the springs, you could give it a little flick to get it up to speed, but instead you have to push down on it with a heavy hand and rub it back and fourth to wind it up. Compared to the flick that represents the end state of releasing all the spring energy, the wind-up is horribly inefficient.
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