A 96lb weight stretches a spring 3.2ft in equilibrium. it is attached to a dashspot with damping constant of 18lb-sec/ft. The weight is initially displaced 15 inches below equilibrium and given a downward velocity of 12ft/sec. a. What is the natural frequency of the mass and spring in hertz? b. What is the critical damping coeficient in lb-sec/ft? c. After how many seconds will the mass cross the equilibriun the first time?

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