[填空题]
The tires of a car make7e1yee, kdjg 6 65 rqs -rms nv-0j3e ..zphevolutions as the car reduces its speed uniformly from 95km/h to 45kmrsn.0 m-h j.epz vsq3-/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