[填空题]
The tires of a car make 85 r36 sk ty ep4.zmj;pe4mevolutions as b9 h 4q8xpihftak.s5 yq 3u,9tthe car reduces its speed uniformly fro,xp9yi 8h k.h93tq satb4f5uqm 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