The transfer function of an open loop system of a DC motor is given as G$($s$)=0\mathrm{.}65/($s$^2+2$s$+1\mathrm{.}0065),$ pls find the steady state error $.$

Note that this is open loop, in principle we should not apply a unity feedback to this system becos it will give rise to another ess value $,$ my understanding is we should use final value theorem, However, if u disagree, and will still need to apply unity feedback, kindly pls quote an internet link so I can be sure source of the information URGENT, hope to get response within today. Thanks