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If k is the force constant of a spring the work
done (against restoring force] in increasing its
extension from l, tol, will be
1) K(12 - 11) 2) K/2(12 +11)
3) K(1,2 -1°)
4 (132-1)
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I hope I help a dash 12 - 11 dash to dash K / 12 + 11
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