[填空题]
The tires of a car m3dbxkk+6gp7k i4 j- yl0: zdxzannka: 8r- ;b1vvk yr7cke 65 revolutions as the car reduces its speed uniformly from 95kmr- nc k:vy1bnka; 7vr8/h to 45km/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