A bridge is found to vibrate violently when a vehicle, producing a harmonic load of magnitude \(600 \mathrm{~N}\), crosses it. By modeling the bridge as an undamped spring-mass system with a mass \(15,000 \mathrm{~kg}\) and a stiffness \(2 \mathrm{MN} / \mathrm{m}\), design a suitable tuned damped vibration absorber. Determine the improvement achieved in the amplitude of the bridge with the absorber.