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A 38.0 kg wheel, essentially a thin hoop with radius 1.30 m, is rotating at 280...

A 38.0 kg wheel, essentially a thin hoop with radius 1.30 m, is rotating at 280 rev/min. It must be brought to a stop in 13 s. How much work must be done to stop it?

Why isn't translational kenetic energy accouted for in this question? I only used rotational kenetic energy for my answer and I appeared to get the right answer. Can you please explain or correct me if I'm wrong.

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