A car’s front suspension has a natural frequency of 0.45 Hz. The car’s front shock absorbers are worn and no longer provide critical damping. The car is driven on a bumpy road with bumps 40 m apart....

A car’s front suspension has a natural frequency of 0.45 Hz. The car’s front shock absorbers are worn and no longer provide critical damping. The car is driven on a bumpy road with bumps 40 m apart. At a certain speed, the driver notices that the car begins to shake violently. What is this speed ?