When a 4.00-kg object is hung vertically on a certain light spring that obeys Hooke’s law, the spring stretches 2.50 cm. If the 4.00-kg object is removed, (a) how far will the spring stretch if a 1.50-kg block is hung on it? (b) How much work must an external agent do to stretch the same spring 4.00 cm from its unstretched position?

Principles of Physics: A Calculus-Based Text
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Author:Raymond A. Serway, John W. Jewett
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Chapter6: Energy Of A System
Section: Chapter Questions
Problem 17P: When a 4.00-kg object is hung vertically on a certain light spring that obeys Hookes law, the spring...
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When a 4.00-kg object is hung vertically on a certain light spring that obeys Hooke’s law, the spring stretches 2.50 cm. If the 4.00-kg object is removed,

(a) how far will the spring stretch if a 1.50-kg block is hung on it?

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

Answer : 

(a) 472 J

(b) 2.76 kN

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