[填空题]
The tires of a car make 65 revoluy* l3 zs1 f8uexh5pp,xtionsoo6- q dmny .coxj/,e( as the car reduces its speed uniformly from 9,oe.qc6mo (yx d -/noj5km/h to 45km/h The tires have a diameter 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