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sciencerules
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the toy car gains energy by pushin down the "head" of the "driver" and is powered by a spring that powers the wheels. at different heights, it has different spring constant. I mean the slope's angles are changed at different periods of the experiment. I am unable to work out the spring constant. isn't it supposed to be Work done by the spring = .5*spring constant*displacement^2?? for different angles, my spring constants are changing. any help in solving my mystery??