[填空题]
The tires of a car make p8vj x ;zs46mr85 revolutions as the car reduces its speed unifobfi-o ;4k-z,wd zh *(kbeg* 0vyk8 dlormly from 90km/h to 60km/h The tires have a diameter of 0.90 m. (a) What was the angular acceleration of ezkf-;wo kbh0,id4 -8 vo*begz d*y (klach 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