(10%; system charateristics - 1st order) Consider the transfer function G(s) = 4/(s+8) of a system. a) Is it stable, unstable, or marginally stable ? b) What is its time constant? c) Determine its 2% and 5% settling times. d) What is its steady-state value for a unit step input? (10%; system charateristics - 2nd order) Consider the transfer function G(s) = 4/(s +3.2s+4) of a system. a) Is it stable, unstable, or marginally stable? b) Is it underdamped, critically damped, or overdamped? c) What is its damping ratio? d) What are its undamped and damped frequencies? e) Determine its 2% settling time.