Q 6.3 p.l42

go = 1/((s + 1)/10 s + T s)
go = Simplify[Factor[%]]

gc = go/(1 + go)

yt = InverseLaplaceTransform[gc/s, s, t];

Plot[{1, yt /. T ->  0, yt /. T ->  0.1, 
        yt /. T ->  1}, {t, 0, 5}, PlotRange ->  {0, 1.7}, 
      PlotStyle ->  {Hue[0.9], Hue[0.7], Hue[0.5]}]