Question: Please help me prepare for my final. Can you give me step by step instructions so I can follow along A 4 5 . 0

Please help me prepare for my final. Can you give me step by step instructions so I can follow along
A 45.0 g disk with a 12.0 cm diameter slows down from 15 rad/s to 11 rad/s. Find the work done on the disk to cause this action.
According to the professor the answer is not -4.2x10^-3J

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