[填空题]
The tires of a car makpl1 n /dty5vvgm 6.cn7e 6/ mck+t9n yo1e+ sr2lm5 revolutions as the car reduces its speed uniformly from 95km/h to 45km/h The timn s 12/t+o e9kylr+mcres 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