A SDOF structure with mass, $m=1kg,$ stiffness, $k=1\frac{N}{cm}$ and damping ratio, $=10\%,$ is acted by a harmonic force $p(t)=5sin(3t)(N).$ Use the tripartite plot for response factors to read $Rv,Rd$ and $Ra$ and calculate the maximum displacement, velocity, and acceleration, $($consider only the steady state motion$).$ Use a ruler to read accurately from the plot. Verify that $Rv=Rd$ and $Ra={}^{2}Rd.$ Also verify that $u_0^{}=u_0$ and $u_0^{}={}^2{u}_0.$