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College Physics

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A 42-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 220 J from 460 J. How high does she rise during this interval? Neglect air resistance.

The quarter is over but I am still trying to figure out how to do several problems so that I can know for the next physics class. If you can help that would be great!

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