Question: A railroad bumper is modeled as a linear spring in parallel with a viscous damper. What is the damping coefficient of a bumper of stiffness

A railroad bumper is modeled as a linear spring in parallel with a viscous damper. What is the damping coefficient of a bumper of stiffness $2 \times 10^{5} \mathrm{~N} / \mathrm{m}$ such that the system has a damping ratio of 1.15 when it is engaged by a 22,000-kg railroad car.

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