[填空题]
The tires of a car make 65 revolutions as r1/j. axx rpptab ublf1/,,j c/0mp-nthe car reduces iq /kt8;7 -hjd,xdacmots speed uniformly from 95km/h to 45km/h The tires have a diameter of 0.80aj7 x,dm8h oc- qd/k;t 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