An electric fan is turned off, and its angular velocity decreases uniformly from 400 rev/min to 220 rev/min in 5.00 s. A) Find the angular acceleration in rev/s^2. B) Find the number of revolutions made by the motor in the 5.00 s interval. C) How many more seconds are required for the fan to come to rest if the angular acceleration remains constant at the value calculated in part A?