The mechanical system in Figure 8.19, where all parameter values are in consistent physical units, is subject to zero initial conditions. Plot two response curves for \(x_{2}\) : one corresponding to \(f_{1}\) as the only input, and another to \(f_{2}\) only. Finally, plot the total response \(x_{2}\).

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FIGURE 8.19 Problems 21 and 22. k =5 m S=5u(t) m = 0.7 x1 ===== k 2 0000 X2 b=0.6 m = 1 2 = u(t)