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In a conservative field, the potential e...

In a conservative field, the potential energy `U` as a function of position `x` is given as `U= x² + x + 3`, then the corresponding conservative force is given by
(a) `2x + 1`
(b)`-2x+1`
(c) ` 2x + 3`
(d)` −2x-1`

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