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Question: When a 2.50 - kg object is

When a 2.50 - kg object is hung vertically on a certain light spring described by Hooke’s law, the spring stretches 2.76 cm.
(a) What is the force constant of the spring?
(b) If the 2.50 - kg object is removed, how far will the spring stretch if a 1.25 - kg block is hung on it?
(c) How much work must an external agent do to stretch the same spring 8.00 cm from its unstretched position?


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