Forced Oscillation and Resonance

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A tractor driver is driving across a field which has regular bumps 5 𝑚 apart from each other. The spring under the driver seat has k=5×104 Nmk=5\times10^4\ \frac{N}{m}k=5×104 mN​ and the mass of the seat is 60 𝑘𝑔 and the mass of the driver is 70 𝑘𝑔. What is the speed of the tractor at which the driver feels the highest oscillations on the seat?

15.6 ms15.6\ \frac{m}{s}15.6 sm​

2 ms2\ \frac{m}{s}2 sm​

23 ms23\ \frac{m}{s}23 sm​

I don't know

Forced Oscillation and Resonance

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Forced Oscillation and Resonance