Question

A person draws water from a 5 m deep well in a bucket of mass 2 kg of capacity 8 litre by a rope of mass 1 kg. What is the total work done by the person? (g = 10 m/s²)

• A. 550 J
• B. 525 J
• C. 125 J
• D. 500 J

Answer 1

Answer: (B)

525 J

Answer 2

Work done to pull rope,

W₁ = $\frac { \mathrm { mg } \ell } { 2 }$ = $\frac { 1 \times 10 \times 5 } { 2 }$ = 25 J

Work done to pull the bucket, W₂ = mgh

= 10 × 10 × 5 = 500 J

Total, W = W₁ + W₂ = 525 J