Suppose that 5 J of work is needed to stretch a spring from its natural length of 24 cm to a length of 40 cm. How much work is needed to stretch the spring from 28 cm to 32 cm? How far beyond its natural length will a force of 20 N keep the spring stretched?

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter1: Vectors
Section1.4: Applications
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Suppose that 5 J of work is needed to stretch a spring from its natural length of 24 cm to a length of 40 cm. How much work is needed to stretch the spring from 28 cm to 32 cm? How far beyond its natural length will a force of 20 N keep the spring stretched?

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