two masses, 18 kg and 26.5 kg, are connected by a rope that hangs over a pulley. the pulley is a uniform cylinder of radius 0.260 meter and mass 7.50 kg. initially, mass 1 is on the ground and mass 2 rests 3.00 meter above the ground. if the system is now released, use conservation of energy to determine the speed of mass 2 just before it strikes the ground. assume the pulley is frictionless.
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