(Plot Using matlab, show code.) (30 pts) For of the SDOF system shown below excited by the pavement profile from problem a. Find and plot the steady-state time history response x(t)-1 plot b. Find and plot the spectrum of x(t) - 1 plot 3. Assume the velocity of the system is 30 km/hour. Include the first 200 harmonics r(t) 4y(i) System parameters:.: 80011: , m,-10kg Time history response in mm for 1 period 5-5% , (Plot Using matlab, show code.) (30 pts) For of the SDOF system shown below excited by the pavement profile from problem a. Find and plot the steady-state time history response x(t)-1 plot b. Find and plot the spectrum of x(t) - 1 plot 3. Assume the velocity of the system is 30 km/hour. Include the first 200 harmonics r(t) 4y(i) System parameters:.: 80011: , m,-10kg Time history response in mm for 1 period 5-5%