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9. A package of mass m is released trom rest at a warebouse loodipe dock and slides down a Without high frietionless chate to a waiting truck. Unfortunately, the tnuck deriver went on a break shown in thing fermoved the previous package of mass 2m, from the bottom of the chuie as 6(20a,Supposethepackagessticktogether.Whatistheircommonspeedafterthecollision? b. Suppose the collision between the packages is perfectly elastic, To what height does the package of mass m rebound