[填空题]
The tires of a car mak.c ksgwdn :f46e 85 zk7cd n8u(n8 qjd3 7w:s-ybhprevolutions as the car reduces its speed uniformly from 90km/h to 60km/h The tires have a diameter of 0.90 m. (a) Whadkqj7y-88dpc z (3 h:wu sb7nnt 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