"to spin a flywheel" i got part a but im not sure about part b?

Question

A flywheel of mass 188 kg has an effective radius of 0.63 m (assume the mass is concentrated along a circumference located at the effective radius of the flywheel).

(a) What torque is required to bring this wheel from rest to a speed of 122 rpm in a time interval of 29.8 s?

(b) How much work is done during the 29.8 s?

Answer 1

B. work = KE = Iω^2/2
I = mr^2
ω = 2pi*rpm/60