Question

A wire fixed at the upper end is stretched by $1m$ by applying a force F. The work done in stretching is

• A. 2F
• B. F
• C. $\frac{F}{2}$
• D. $\frac{F}{2}$

Answer 1

The correct option is D $\frac{F}{2}$

$W=U=\frac{1}{2}k{x}^2$
$=\frac{1}{2}\left(kx\right)x$
$=\frac{1}{2}Fx$
$=\frac{F1}{2}$