[填空题]
The tires of a car make 85 revolur)tgg))a8 3upu-x:sem ku p k(7(sfx1 vst1 jbtions as thev3c205*aiunn ifg s 1.wbeo k q/yk(j; car reduces its speed uniformly from 90km/h to 60km/h The tires have a dis3 yk2/v0in (qn* wuo15jgb.keica;f ameter 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