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a 40 kg child is standing on the edge of a 100 kg merry go round(...

a 40 kg child is standing on the edge of a 100 kg merry go round( flat disk), with a radius of 4m. The merry go round is initially traveling at 20 rads/s. The child walks towards the center of the merry go round , until she is 0.5m from the center. What is the final angular speed other child at the new location?

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