1) The document discusses the unit step response of a second order system described by the differential equation ÿ( t) + 5ẏ( t) + 6y( t) = u(t). 2) The transfer function of the system is P(s) = 1/(s^2 + 5s + 6), with poles at -2 and -3. 3) The unit step response is y(t) = 1/6 - 1/2e^(-2t) + 1/3e^(-3t), where the exponents are the poles of the system.