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4. A soapbox derby is to be held on a hill with a 28 m vertical drop. The track is 300m long. Friction provides an

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4. A soapbox derby is to be held on a hill with a 28 m vertical drop. The track is 300m long. Friction provides an 80 N opposing force on the car. a. What is the change in potential energy of a racecar from start to finish if it and the driver have a combined mass of 113 kg? b. How fast is the car moving at the finish line

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