[填空题]
The tires of a car make 65 revolutions as the car reducnnq u 7unn.mhb xlp.oy31-k5/ 5f7ifd es its speed un gp **p)upk8rpab: db1iformly from 95km/h to 45km/h The tires hadg *8ru:*ppk1pabp )bve 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