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A soapbox derby race car starts at rest at the top of a track that has...

A soapbox derby race car starts at rest at the top of a track that has a vertical drop of 15 m. The car is to be stopped at the end of the track by colliding with and compressing a spring. In order to avoid injury to the driver, the spring must be compressed to 3.0 m before the car stops. What should be the force constant of this spring? Assume the mass of the car and driver is 113 kg.

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