[填空题]
The tires of a car make zm s*;:7whvm a3h+khhvt s3hgscp(n)0b i g;a2x59f n65 revolutions as the car reduces its speed uniformly from 95km/h to 45km/h 3v9hhipsb;5)2a(gt hsxn3 f+k 0cnh g 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