Question: you have a light spring which obeys hookes law. the spring stretches 2.28 cm when a 2.7 kg object is suspended from it. what is

you have a light spring which obeys hookes law. the spring stretches 2.28 cm when a 2.7 kg object is suspended from it. what is the amount of energy in joules an external agent must do to stretch the spring 7.8cm from its unstretched position

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