Question

When a load of $5 \,kg$ is hung on a wire then extension of $3$ metre takes place, then work done will be:

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

Answer 1

Answer: (A)

75 J

Answer 2

Work done $=\frac{1}{2}\,mgh=\frac{1}{2}\,\times 5\times 10\times 3$ $= 75\,J$