[填空题]
The tires of a car make 65 revolutions a wxajst*+i0qiju( ;u(s the car reduces its kz;b qgi-3. :ti(rd*st phtt0 speed uniformly from 95km/h to 45km/htttbikp; g-(d3 tzq s*hi:0.r 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