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>> I wasn't exactly sure how to do this, so I thought I'd try with the rotational kinetic formula from the first half of General Physics. That formula was 1/2(m)(r^2)(w^2). I don't think it gave me the answer they were looking for... it wants an answer in Joules and I'm not sure where to start or how to finish it. Or if this is even along the right steps to take...

:grumpy: