The blades of a fan running at low speed turn at 250 rpm. When the fan is

Question:

The blades of a fan running at low speed turn at 250 rpm. When the fan is switched to high speed, the rotation rate increases uniformly to 350 rpm in 5.75 s.
(a) What is the magnitude of the angular acceleration of the blades?
(b) How many revolutions do the blades go through while the fan is accelerating?