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 At t = 0, x = 0 and dx/dt = 1 m/s.

(a) Determine the frequency and period of the resulting vibration.

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(b) What is the value of x at t = 4 s?