[填空题]
The tires of a car make 65 revolutions as tt/3z *,ytwfc hhe car redu(j *(auvt-jn)xkrq v7 ces its speed uniformly fromj*j q-xk(u tr7v )nva( 95km/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