[填空题]
The tires of a car make 85 revolutions(aurt 0c7)7ixbl0o1:e 4vvl 0kkuzes as the car reduces its spwmv w vyp zxb:ou4sip:) 1)j6.eed uniformly from 90km/h to 60km/h The tires y1iuw b) x pv ws4:):jvm6o.pzhave 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