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The potential energy "(U)" of a particle...

The potential energy "(U)" of a particle in a conservative field varies with position "(x)" as `U=(4x^(3))/(3)-x^(2)`, where "U" and "x" are in SI unit.Then

The position of unstable equilibrium is x=0

The position of unstable equilibrium is x= - `(1)/(2)`

The position of stable equilibrium is x=0

The position of stable equilibrium is x=`(1)/(2)`

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