Posted by **Allie** on Tuesday, September 27, 2011 at 7:08pm.

When a 3.00-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 3.07 cm.

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

N/m

(b) If the 3.00-kg object is removed, how far will the spring stretch if a 1.50-kg block is hung on it?

cm

(c) How much work must an external agent do to stretch the same spring 9.10 cm from its unstretched position?

J

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