Adam and Bobby are twins who have the same weight. Adam drops to the ground from a tree at the same time that Bobby begins his descent down a frictionless slide. If they both start at the same height above the ground, how do their kinetic energies compare when they hit the ground? Bobby has twice the kinetic energy as Adam More information is required to compare their kinetic energies. Adam has greater kinetic energy than Bobby. They have the same kinetic energy. Bobby has greater kinetic energy than Adam.
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