[填空题]
The tires of a car makevch*stu:p,f 9 65 revolutions as the car reduces its spt3 r + kz5i1fxm 94lr9objlx3reed uniformly from 95km/h to 45km/h The tires have a diam43mbx rof i 3kj +t59zlxrl19reter of 0.80 m. (a) What was the angular acceleration of the tires? $\approx$ $rad/s^2$ (b) If the car continues to decelerate at this rate, how much more time is required for it to stop? s