For an SDOF system under applied force F=725sin(30t), having mass of 60 kg, spring stiffness of 10 kN/m and damping constant of 500 N.s/m. Determine the Amplitude, and phase angle (in degrees) of the system. Is it underdamped, or critically damped? Also, find the Amplitude and Phase angle when it is under resonance.

For an SDOF system under applied force F=725sin(30t), having mass of 60 kg, spring stiffness of 10 kN/m and damping constant of 500 N.s/m. Determine the Amplitude, and phase angle (in degrees) of the system. Is it underdamped, or critically damped? Also, find the Amplitude and Phase angle when it is under resonance.