P15. The unity feedback system has an open-loop transfer function, as in fig.P15. What will be the parameters K,, to meet the error steady state for step input equal to 0.1 , undamped natural frequency 10rad/sec. and damping ratio equal to 0.5 . r+yr+4 P16. Consider unity feedback has an open loop transfer function below. Find: 1-The static error constant. 2- error steady state for r(t)=3+5t. G(s)=s(s+3)(s+4)20(s+2) P17. The signal flow graph of the control system shown in fig.P17 what are the following: 1- The type and the system order. 2- The error steady state. Fig. P17