[填空题]
The tires of a car make 85,rg3)3s 2rn/ueqz fx x:dgh7v revoivu4s h.,. kzglutions as the car reduces its speed uniformly from 90ks z.g vuk4ih.,m/h to 60km/h 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