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A 30 kg boy jumps from a platform to a trampoline. He is travelling at a speed of 4.0 m/s before he hits it. 7.

A 30 kg boy jumps from a platform to a trampoline. He is travelling at a speed of 4.0 m/s before he hits it. 7. From what height did he jump? 8. How much energy is in the system

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