The tires of a car make 55 revolutions as the car reduces its speed uniformly from 100 km/h to 40 km/h. The tires have a diameter of 0.80 m.
(a) What was the angular acceleration of the tires?
____rad/s2
(b) If the car continues to decelerate at this rate, how much more time is required for it to stop?
_____s