Consider the base$-$excitation problem of Section$2\mathrm{.}4$ as applied to an automobile model of Example $2\mathrm{.}4\mathrm{.}2$ and illustrated in Figure $2\mathrm{.}17.$ Recall that the model is a spring$$mass$$damper system with values In this problem let the road have a random stationary cross section producing a PSD of Calculate the PSD of the response and the mean$-$square value of the response.