Question: When a 2 . 90 - kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 2 .

When a 2.90-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 2.92 cm. How much work must an external agent do to stretch the same spring 9.50 cm from its unstretched position?

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