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When a 4.00 kg object is hung vertically on a certain light spring, the spring stretches 2.50 cm. If the 4.00 kg
object is removed,how much work (in J) must an external agent do to stretch the same spring 7.00 cm from its unstretched
position? (g-10 m/s²)
1. 01.3
2. 02.0
3. 02.9
4. 03.9
5. 05.1
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