[填空题]
The tires of a car mf:i 0seo, 9daklca *i7.hlws: k iba9wv:+8m9q0h nnnc8 oob*ake 65 revolutions as the car reduces its speed uniformly from n8bkowhb9+ vi* 0nm8nc a9: oq95km/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