In an M-DOF system the mass, stiffness and damping matrices are a. not symmetric. b. symmetric except for the damping matrix. e. always symmetric. d. can be symmetric or non-symmetric depending on the system. Which of the following is the most appropriate schematization of a car suspension running into a road pothole a. an SDOF oscillator composed of a mass and a spring and subjected to a constant force. b. an SDOF oscillator composed of a mass and a dashpot subjected to an impulse or a base excitation. c. an SDOF oscillator composed of a mass, a spring and a dashpot subjected to an impulse.