The steady state error for a unity feedback system for the input r(t) = Rt^2/2 to the system G(s) = K(s+2)/s(s3+7s2+12s) is

The steady state error for a unity feedback system for the input r(t)

1.	The steady state error for a unity feedback system for the input r(t) = Rt^2/2 to the system G(s) = K(s+2)/s(s3+7s2+12s) is
A.	0
B.	6r/k
C.	âˆž
D.	3r/k
Answer» C. âˆž