[填空题]
The tires of a car make 85 revolutiom 9;vu8zioo n- (zha4tns as the car reduces its speed uniformly frz (o;4amuoi8v-9 h zntx 8zo 8l )4)pbp *owk;kcxwb3coocl )*w)4 bp;8kx38o c bkzxpwm 90km/h to 60km/h The tires have a diameter of 0.90 m. (a) What was the angular acceleration of each tire? $\approx$ $rad/s^2$(round to two decimal place) (b) If the car continues to decelerate at this rate, how much more time is required for it to stop? s