Flywheel shaped like a solid cylinder?

Question

with a radius of 0.499 m and mass of 10.1 kg is brought to an angular speed of 5.88 rad/s in 0.531 s by a motor exerting a constant torque. After the motor is turned off, the flywheel makes 26.8 rev before coming to rest because of friction (assumed constant during rotation).

What percentage of the power generated by the motor is used to overcome friction?

Answer 1

since with no motor it stopped the only possible answer is 100%

the motor had to accelerate the mass so FOR A TIME less than 100% but once the mass was in motion the only power requirement was that required to overcome drag ( friction )

the interesting part is that if you remove the cylinder and run the motor only the same answer still applies

if you want a different answer then you can rephrase the question - what amount of 'power' did the motor impart to the flywheel or what amount of 'power' was used to accelerate the flywheel ( the power will always be 100% used so you need the kilowatts or horsepower or some other measurement for a useful answer )