An engineer decides to damp the oscillations by applying one shock absorber to each spring. These shock absorbers apply a velocity-dependent drag force F = -bu that opposes the motion of the bench. For proper damping, the engineer decides that the motion of the bench should drop to one-half of its initial amplitude within 0.367 s. When purchasing shock absorbers, what damping coefficient b should the engineer specify to the industrial equipment supplier? Assume that the oscillations are underdamped.