[填空题]
The tires of a car make 85 revolutiont8c;+ 5awzs3 9wda vgngl:w3ls as the car reduce1qo o)ebp 9 .-cy7l 1awl1f:dfi *ggins its speed uniformly from 90km/h to 60km/h The tires have a diameter of 0.90 m. (a) What was the aninoyga:dqf-f9o lpb gw) 7e1.c1 1i*lgular 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