A package of mass mm is released from rest at a warehouse loading dock and slides down the hhh = 3.4 mm - high, frictionless chute to a waiting truck. Unfortunately, the truck driver went on a break without having removed the previous package, of mass 2m2m, from the bottom of the chute.   Suppose the packages stick together. What is their common speed after the collision?  I got the answer to be 2.7 m/s which is correct.   Suppose the collision between the packages is perfectly elastic. To what height does the package of mass mm rebound?

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