.15. A viscously damped single degree of freedom mass-spring system has a mass m of 2 kg, a spring coefficient k of 2000 N/m, and a damping constant c of 5 N- s/m. Determine (a) the damping factor 5, (b) the natural frequency w, (c) the damped natural frequency wd, and (d) the spring coefficient needed to obtain critically damped system.

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