A system contains a perfectly elastic spring, with an unstretched length of 20 cm and a spring constant of 4 N/cm. When the length of the spring changes from an initial value of 22.0 cm to a final value, the elastic potential energy it contributes changes by −0.0800 J. Find the final length.

Physics for Scientists and Engineers: Foundations and Connections
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Author:Katz, Debora M.
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Chapter8: Conservation Of Energy
Section: Chapter Questions
Problem 68PQ: After ripping the padding off a chair you are refurbishing, you notice that there are six springs...
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A system contains a perfectly elastic spring, with an unstretched length of 20 cm and a spring constant of 4 N/cm.

When the length of the spring changes from an initial
value of 22.0 cm to a final value, the elastic potential energy it contributes changes by −0.0800 J. Find the
final length.

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