One end of a horizontal spring (k = 66.1 N/m) is held fixed while an external force is applied to the free end, stretching it slowly from xA = 0 to xB = 3.50 cm.
(a) Find the work done by the applied force on the spring.
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(b) Find the additional work done in stretching the spring from xB = 3.50 cm to xC = 6.46 cm.
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