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A bungee cord exerts a nonlinear elastic force of magnitude F(x) = k1x + k2x3, where...

A bungee cord exerts a nonlinear elastic force of magnitude F(x) = k1x + k2x3, where x is the distance the cord is stretched, k1 = 203 N/m and k2 = −0.220 N/m3. How much work (in kJ) must be done on the cord to stretch it 15.0 m?

_? kJ

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