Question

When a load of $5Kg$ is hung on a wire, an extension of $3m$ takes place, then work done will be

• A. $75J$
• B. $60J$
• C. $50J$
• D. $100J$

Answer 1

The correct option is A $75J$

$W=\frac{1}{2}Fl$

$=\frac{1}{2}\times Mg\times l$

$=\frac{1}{2}\times 5\times 10\times 3=75J$

Hence,

option $\left(A\right)$ is correct answer.