A car has a unibody-type frame and is supported by four suspension springs, each with a force constant of 12400 N/m. The combined mass of the car’s frame and everything inside it (the engine, the seats, the passengers, etc.) is 1500 kg. Because of worn-out shockabsorbers, the car vibrates up and down every time it is driven over a pothole. What is the frequency of this vibration? Answer in units of Hz.
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