A) Kl/2
B) Kl
C) \[K{{l}^{2}}/2\]
D) \[K{{l}^{2}}\]
Correct Answer: C
Solution :
\[K=\frac{F}{l}\]and \[W=\frac{1}{2}Fl=\frac{1}{2}Kl\times l=\frac{1}{2}K{{l}^{2}}\]
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