The spring constant is k = 800 N/m, and the spring is unstretched when x = 0. The mass of...

The spring constant is k = 800 N/m, and the spring is unstretched when x = 0. The mass of each object is 30 kg. The inclined surface is smooth. The radius of the pulley is 120 mm and its moment of inertia is I = 0.03 kg-m2. Determine the frequency and period of vibration of the system relative to its equilibrium position if (a) c = 0 and (b) c = 250 N-s/m.