[填空题]
The tires of a car make w m3w i x(xjhb3wn3laum0t-7965qa0*8:xudn.b 3 ip ydyb0bu7t revolutions as the car reduces its speed uniformly from 95km/h to 45km/h The tires have u3.a xbyundpit7*byb00 8:q da 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