Posted by **alexandra** on Wednesday, April 21, 2010 at 2:49pm.

When a 2.60-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 2.30 cm.

(a) What is the force constant of the spring?

(b) If the 2.60-kg object is removed, how far will the spring stretch if a 1.30-kg block is hung on it?

(c) How much work must an external agent do to stretch the same spring 8.40 cm from its unstretched position?

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