4.18 A process has the transfer function G(s)=s2+s+12=U(s)Y(s) (a) For a step change in the input U(s)=2/s, sketch the response y(t) (you do not need to solve the differential equation). Show as much detail as possible, including the steady-state value of y(t), and whether there is oscillation. (b) What is the decay ratio