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Q. The tub of a washer goes into its spin cycle, starting from rest and gaining angular speed steadily for 8s, at which time it is turning at 7 rev/s. At this point, person doing the laundry opens the lid, and a safety switch turns off the washer. The tub smoothly slows to rest in 11-s. Through how many revolutions does the tub turn while it is in motion?

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