[填空题]
The tires of a car makej hc,65.xlshm- pcdx8nhycz94 md l8+65 revolutions as the car reduces its speed uniformly from 95km/h to 45km/h The tip89dd- +h8 nlcz4myx cres 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