[填空题]
The tires of a car make 85 revolut7lw v-5 e5e7 gz )9icaun4uw wgl+-uaqion-vezt0o.xg 0a x xk:g/s as the car reduces its speed uniformly from 90km/h to 60km/h The tires have a diameter of 0.90 m. (a) What was the angular accg0aoget-xx /0.zkx: veleration 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