[填空题]
The tires of a car makeb3zf:/nn ca7j+h -6ahth m9r zj tb 2c4 4e+*o8kh :wz ev2ynxxtn54gv65 revolutions as the car reduces its speed uniformly from 95km/h to 45km/h The tires have a diameterkvv4+xo 4 b2t we5c8ge:yh*nzx4 2n tj 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