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A package of mass m is released from rest at a warehouse loading dock and slides...

A package of mass m is released from rest at a warehouse loading dock and slides down the h = 2.0 m - high, frictionless chute to a waiting truck. Unfortunately, the truck driver went on a break without having removed the previous package, of mass 2m, from the bottom of the chute.

Suppose the collision between the packages is perfectly elastic. To what height does the package of mass m rebound?

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