[填空题]
The tires of a car make 85 lh,/u wxhc; x *y,8xtv bf,xipl6/zv3 revoldvy2iytg2xww8imis 32:hqbg )43g3dh b tg2*utions as the car reduces its speed uniformly from 90km/h to 6y3t i 82tv3w3hg2ybis dxg2d bw4) gq2m:*hig0km/h The tires have a diameter 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