[填空题]
The tires of a car make 65 revbj p-+fkfn40molutions as the car reduc 1r 7pfhudy-+5(dgl)k7cp t thes its speed uniformly from 95km/h to 45km/h Th-td7kyr+ 1h(p)7luf5hcgd pt e 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