Potential energy of a not obeing hookes law spring is given, Ask an Expert

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Potential energy of a not obeing Hooke's law spring is given by the equation U(x)=5.00(J/m)x - 2.00(J/m3)x3, where x is the distance the spring is stretched/compressed from its equilibrium position.

A) What is the expression for the restoring force of the spring?

B) When (in terms of x) the spring is at equilibrium?

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