When a 2.70-kg object is hung vertically on a certain light spring described by Hooke's law, the spring stretches 3.06 cm.

(a) What is the force constant of the spring? (in N/m)

(b) If the 2.70-kg object is removed, how far will the spring stretch if a 1.35-kg block is hung on it? (in cm)

(c) How much work must an external agent do to stretch the same spring 6.40 cm from its unstretched position? (in J)

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