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A 1.0 kg mass is attached to a string wrapped around a shaft of negligible mass...

A 1.0 kg mass is attached to a string wrapped around a shaft of negligible mass and having a 5.0 cm radius. A dumbbell-shaped "flywheel" made from two .500 kg masses is attached to one end of the shaft and perpendicular to its axis. The mass is released from rest and allowed to fall .8 m to the floor. It reaches a speed of 1.5238 m/s just before striking the floor. How far apart are the masses of the dumbbell?

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