[填空题]
The tires of a car make rjn-f -oqqt3smgoipdv 76x k,38 6fs1 65 revolutions as the car reduces its+664gt +wo5f i a.vngiopr9xm speed uniformly from 95km/h to 45km/h The tires have a diametergii+xnr946o+56 tmagv.f p wo 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