A wire fixed at the upper end stretches by length $l$ by applying a force $F$. The work done in stretching is
AIEEE 2004, Easy
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$F_{a v}=\frac{0+F}{2}=\frac{F}{2}$
$W=\left(\frac{0+F}{2}\right) \ell=\frac{F \ell}{2}$
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