This feedback control system represents Integral Control of a Mass-Spring-Damper system: Controller Mass-Spring-Damper R(s) Y(s) K 1 s+2s +6 S NOTE: 1) Integral control is being used here (i.e. C(s) = E(s) U(S)-KI). Y(s) R(s) Determine the values of gain "K," for which the closed-loop system (i.e. stable. ) remains