The unity feedback system has an \( \boldsymbol{E}_{s s}=1 / 6000 \) for an input of \( 10 t u(t) \). Given: \[ G(s)=\frac{k\left(s^{2}+3 s+30\right)}{s^{n}(s+5)} \] Find \( k \) and \( n \) that