The work done in joules in increasing the extension P of a spring o...

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The work done in joules in increasing the extension
P of a spring of stiffness \( 10 \mathrm{~N} / \mathrm{cm} \) from \( 4 \mathrm{~cm} \) to \( 6 \mathrm{~cm} \)

W is:
(1) 1
(2) 10
(3) 50
(4) 100
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