[填空题]
The tires of a car makejkrucq :s+8hg(.(ikr 65 rer+fipsa(c *k; volutions as the car reduces its speed uniformly from 95km/h to 45km/h The tires have a diametes+ir* a(p cfk;r 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