Determine the static error constant to a unit ramp function if the transfer function of the closed-loop control system, shown in Fig. 7.3 , is as follows:

1) \(k_{v}=\frac{3}{5}\)
2) \(k_{v}=\frac{5}{6}\)
3) \(k_{v}=\frac{5}{3}\)
4) \(k_{v}=\frac{6}{5}\)

Figure 7.3

T(s): S+6 = (s+1)(s+2)(s+3)