If the dashpot has a damping coefficient of c = 50 N • s/m, and the spring has a stiffne...

If the dashpot has a damping coefficient of c = 50 N • s/m, and the spring has a stiffness of k = 600 N/m, show that the system is underdamped, and then find the pendulum's period of oscillation. The uniform rods have a mass per unit length of 10 kg/m.