[填空题]
The tires of a car make)bu c.niz tub;ebx*17 bkdqike 65m; :85 revolutions as the car reduces its speed uniformly from 90km/h to 60km/h The tires have a diameter of 0.90 m. (a) What was the angular acceleratioed5i6 kq:k;m bn 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