[填空题]
The tires of a car make 65zv 0cm-l z.gn05+tiqxe57/qv xg 6lsi revolutions as the car reduces it5 z-f4 j)ki47lj mxkbws speed uniformly from 95km/h to 45km/h The tires have a diamet5kxw7jj f )ib4z-4lmker 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