[填空题]
The tires of a car make 85 revolutions apzp yqru eb o* j+b67g3*ci: 8(wkj7lqs the car reduces its sii nck52ay4ms,vo q1axy/*+i peed uniformly from 90km/h to 60km/h The tires have a diameter of 0.90 m. (a) What was the angulx vkm *c1n s5y/q+iai2y ao,i4ar 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