[填空题]
The tires of a car make 85 revolutio6 /bmw;u+ ihoons as theyne10e 8 n+t yp04hrt4r4vaqx car reduces its speed uniformly from 90km/h to 60km/h The tires have a diam 04t nh8rn4te ye4+xvqrpy a01eter 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