A spring-damper system is designed to support an electric motor which has a total mass of 20 kg and a rotor of 12 kg. Initially, the system has a static deflection of 5 mm after the motor is mounted on the springdamper support, and the center of the rotor is 3 mm misaligned. In free vibration, a displacement of 10 mm is damped to 1 mm in two cycles. Determine the amplitude of the force transmitted to the ground through the spring-damper support system when the motor is operating at 1,200 rpm.