Investigate the boundedness of the first and second moments of stationary stochastic response of the system m\ddot{X}(t)+c\dot{X}(t)=F(t) , for which the impulse response function was derived in Example 5.2
x(t)=\int_{-\infty }^{\infty }{f(s)h_{x}(t-s)ds} \equiv \int_{-\infty }^{\infty }{f(t-r)h_{x}(r)dr}as
h_{x}(t)=c^{-1}(1-e^{-ct/m})U(t)