[填空题]
The tires of a car makwt )3fkp)z(s te 65 revolutions as n3ur ltofb4 .*the car reduces its speed uniformly from 95km/h to 45km/h The tires have a diameter of 0.80 mr.43 t*uolnbf. (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