[填空题]
The tires of a car make 85 revolutions as thel46wikw:8 dnz car reducp p3p))8,h fzl6 kdia,mo8gspes its speed uniformly from 90km/h to 60km/pko)38 a )s,8 dmi,ppp6lfg zhh 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