Three Solid,uniform,cylindrical Flywheels,each of Mass 65

Multiple Choice

Three solid,uniform,cylindrical flywheels,each of mass 65.0 kg and radius 1.47 m rotate independently around a common axis.Two of the flywheels rotate in one direction at the other rotates in the opposite direction at 3.42 rad/s.Calculate the magnitude of the net angular momentum of the system.

A) 298 kg ∙ m²/s
B) 778 kg ∙ m²/s
C) 257 kg ∙ m²/s
D) 222 kg ∙ m²/s