[填空题]
The tires of a car make 85 revolutions as the car rew .*/w 4lc1+/hl zy 2iao3-jpq dunhqlducesqg bi-l-z15gm-o sjd 2+bh:j64 dkfpo its speed uniformly from 90km/h to 60km/h The tires have a diameter of 0.90 m. (a) What was the angular qd-dg5:2boj1bj- ms hl4o zg-p +ifk6acceleration 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