The force a spring exerts on a body is a conservative force because
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a spring always exerts a force opposite to the displacement of the body.
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a spring always exerts a force parallel to the displacement of the body.
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the work a spring does on a body is equal for compressions and extensions of equal magnitude.
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the work a spring does on a body is equal and opposite for compressions and extensions of equal magnitude.
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the net work a spring does on a body is zero when the body returns to its initial position.