Question: For a certain type of nonlinear spring, the force required to keep the spring stretched a distance s is given by the formula F =

For a certain type of nonlinear spring, the force required to keep the spring stretched a distance s is given by the formula F = ks4/3. If the force required to keep it stretched 8 inches is 2 pounds, how much work is done in stretching this spring 27 inches?

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