[填空题]
The tires of a car make 85 revolutions as the izc o(vj9m -/5j) 0wl kjb)yuocar reduces its speed unifs2 ioe*rx.u9uph*nf/6m4sd t ormly from 90km/h to 60km/h The tires have a diameter of 0.90 m. (a) What was x ir/9nm*usf eto.sp4h6 *2du the angular acceleration of each tire? $\approx$ $rad/s^2$(round to two decimal place) (b) If the car continues to decelerate at this rate, how much more time is required for it to stop? s