If an automobile weighs 3000 lb and has an undamped natural frequency of 1.0 Hz when it oscillates on its main suspension springs, what should the total stiffness of the four shock absorbers be if a...

If an automobile weighs 3000 lb and has an undamped natural frequency of 1.0 Hz when it oscillates on its main suspension springs, what should the total stiffness of the four shock absorbers be if a damping ratio of 0.707 is to be achieved? Consider the shock absorbers to be linear dampers even though, in practice, shock absorbers are distinctly nonlinear.