[填空题]
The tires of a car make 85 revolutions as the k 2ytmukg,w/) car reduces its speed uniformly fr,)ukm g twk2/y qs+kha:kf;/ez yo06 hom 90kme6f+o /q;0azyh:ksk h/h to 60km/h The tires have a diameter of 0.90 m. (a) What was the angular acceleration of each tire? $\approx$ $rad/s^2$(round to two decimal place) (b) If the car continues to decelerate at this rate, how much more time is required for it to stop? s