A plane's propeller has a rotational inertia of 2.0 kg . m. After a clockwise torque of 4.0 N . m was rad applied to the propeller for 4.0s. the propeller has a clockwise angular speed of 1.0 S What was the initial angular momentum of the propeller before the torque was applied? O 20 kg.m^2/s O 52 kg.m^2/s 14 kg.m^2/s 34 kg.m^2/s