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If a mass weighing 40 lbs stretches a spring 6 inches what is the spring constant?...

If a mass weighing 40 lbs stretches a spring 6 inches what is the spring constant? If the mass has a velocity of 4 ft/sec and this results in a viscous resistance of 68 lbs what is the damping coefficient? Assume 32lb=1 slug32lb=1 slug  

1. suppose the object is displaced upward 8 inches from equilibrium and released. Create an ODE in terms of the object's displacement, u(t)u(t) , in feet after tt  seconds and its derivatives and solve for u(t)u(t) .

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