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![f=\frac{1}{2\pi } \sqrt{\frac{k}{m} }\\ k=m(2\pi f)^{2}\\ k=1800kg[2\pi (1.905Hz)]^{2} \\k=257.6kN/m](/tpl/images/0518/9558/506f0.png)
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A car with a total mass of 1800 kg (including passengers) is driving down a washboard road with bump...
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