Eighteen foot-pounds of work is required to stretch a spring 4 inches from its natural
Chapter 7, Problem 11(choose chapter or problem)
Hooke’s Law In Exercises 5–12, use Hooke’s Law to determine the variable force in the spring problem.
Eighteen foot-pounds of work is required to stretch a spring 4 inches from its natural length. Find the work required to stretch the spring an additional 3 inches.
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