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A record player turntable initially rotating at 3313 rev/min is braked to a stop at a...

A record player turntable initially rotating at 3313 rev/min is braked to a stop at a constant rotational acceleration. The turntable has a rotational inertia of 0.021 kg⋅m2 . When it is switched off, it slows down to 75% of its initial rotational speed in 7.5 s .

1. How long does it take to come to rest?

2. How much work has to be done on the turntable to bring it to rest?

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