[填空题]
The tires of a car make 65 revolucwe6c*ei0 e 715 7uavzlrxn w4tions as the car redzjc qs) vpcrh5*/y -f9uces its speed uniformly from 95km/h to 45km/hqvyrc *z -jf9p5c)s h/ The tires have a diameter of 0.80 m. (a) What was the angular acceleration of the tires? $\approx$ $rad/s^2$ (b) If the car continues to decelerate at this rate, how much more time is required for it to stop? s