A 27.0 kg wheel, essentially a thin hoop with radius 1.10 m, is rotating at 280 rev/min. It must be brought to a stop in 15.0 s. (a) How much work

A 27.0 kg wheel, essentially a thin hoop with radius 1.10 m, is rotating at 280 rev/min. It must be brought to a stop in 15.0 s. (a) How much work must be done to stop it? (b) What is the required average power?