[填空题]
The tires of a car m:5pb29ienzy4bk pz7;z 2v or aake 85 revojtma p 6.d.lb+lutions as the car reduces its speed uniformly from 90km/h to 60km/h The tires have t..dm apl6 j+ba 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