[填空题]
The tires of a car ma+wtd znk/ns.x:4)0cs+w x kb qko8;mdse( ak 77 a)65jh um.(9eq.bx2eyhvr t,c lvcake 85 revolutions 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 accelerati.c c79myqh) ta xlve re5,h6a2. (jubvon 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