(i) Formulate the equation of motion for the system shown in Figure below. List two assumptions made in this formulation.
(ii) Find the response of this system at t = 3s. The system begins with the displacement of 5 cm and velocity of 3 cm/s. Given that m = 300 kg, k = 5 kN/m and c = 150 Ns/m. Draw the displacement response time history.