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A bungee cord exerts a nonlinear elastic force of magnitude F(x) = kx + k2x, where x is the distance the cord is stretched,

A bungee cord exerts a nonlinear elastic force of magnitude F(x) = kx + k2x, where x is the distance the cord is stretched, k =204 N/m and k2 -0.223 N/m. How much work must be done on the cord to stretch it 16.7 m? W = KJ

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