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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 0.500- kg masses is attached to one end of the shaft and perpendicular to its axis (see the figure). The mass is released from rest and allowed to fall 1.4 m to the floor. It reaches a speed of 1.2139 m/s just before striking the floor. How far apart are the masses of the dumbbell?

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