[填空题]
The tires of a car make af ,/dfmxp a4+uap j1+k vfy7465 revolutions as the car reduces its speed uniformly from 95km/h to 45km/h The tires have a diametp1y7afu+4vj k er 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