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The tires of a car make 55 revolutions as the car reduces its speed uniformly from...

The tires of a car make 55 revolutions as the car reduces its speed uniformly from 110 km/h to 60 km/h. The tires have a diameter of 0.80 m.
(1) What was the angular acceleration?

(2) If the car continues to decelerate at this rate, how much more time is required for it to stop?

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