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A 17.7 kg package is released from rest down a 38.0 chute. When the package reaches the bottom it undergoes a perfectly elastic collision with

A 17.7 kg package is released from rest down a 38.0 chute. When the package reaches the bottom it undergoes a perfectly elastic collision with a 35.4 kg stationary package, giving this second package a speed of 7.91 m/s. Assuming the chute is frictionless, what height must the first package have been released from?

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