A DC motor with an internal armature resistance of \(2.0 \ \Omega\) is connected across a constant \(24 \text{ V}\) power source. When the motor is prevented from turning (stalled), it draws a large current because no back-emf is generated. When operating at its normal running speed, the rotating motor generates a back-emf of \(20 \text{ V}\). What are the electric current through the motor and the mechanical power output produced by the motor at normal operating speed?