[填空题]
The tires of a car make 65 revolutions as the car reduces its speed uj(c1 :l9rahni nifov6; pj6s a5.xu :fcfzormly from 95km/h to 45km/h The tir.6o fu ;:6s j5vazcxpfes 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