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While spinning down from 300.0 rpm to rest, a solid uniform flywheel does 4.9 kJ of...

While spinning down from 300.0 rpm to rest, a solid uniform flywheel does 4.9 kJ of work. If the radius of the disk is 1.0m, what is its mass?

options:

19.9 kg

125 kg

45.6 kg

11.0 kg
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