Question: When a 4 . 0 0 - kg object is hung vertically on a certain light spring that obeys Hooke's law, the spring stretches 2

When a 4.00-kg object is hung vertically on a certain light spring that obeys Hooke's law, the spring stretches 2.50 cm. If the 4.00 kg object is removed. How much work must an external agent do to stretch the same spring 4.00 cm from its unstretched position?

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