A particular motor has the following specifications: no load speed = 5000 rpm, stall torque = 200mN-m, no load current = 0.25 A, rated operating = 2500 rpm, 100mN-m, 5A. Create the speed-torque curve, torque-current curve, power-torque curve, and determine the operating point (speed, torque) for maximum efficiency based on a 12V DC input voltage.