displacement relative to x Consider the mass-spring system x" + bx' + 4x = 0. (a) Determine whether the system is undamped, underdamped, critically damped, or overdamped and whether it is forced or unforced for b = 2, b = 4, b = 5. = = 0 with (b) The following graph show us solutions of x" + bx' + 4x three different values of b: b = 2, b = 4, b = 5. Choose the value of b that corresponds to each curve (blue, green, red) in this graph. 0.5 -0.5 time