### Find how many revolutions does the tub turn

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The tub of a washer goes into its spin-dry cycle, starting from rest and reaching an angular speed of 2.0 rev/s in 8.0 s. At this point, the person doing the laundry opens the lid, and a safety switch turns off the washer. The tub slows to rest in 13.0 s. Through how many revolutions does the tub turn during this 21-s interval? Assume constant angular acceleration while it is starting and stopping.

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