[填空题]
The tires of a car make 85 revolutions as the car reduc 2hj5 qvt,jxf;toll,s x0 ;p-tes its qrz(0 zvt:kj 4speed uniformly from 90km/h to 60km/h The tit(k0:v z q4jrzres 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