First slide

Work done by Diff type of forces

Question

A bucket filled with water weighing 20 kg is slowly raised from a well of depth 20m. If the linear density of the rope is 0.2kg per meter, the amount of work done is, (g = 10m/ $s^{2}$ )

Moderate

A

4000J
B

4040J
C

4400J
D

4200J

Solution

$W = m g h + M g \frac{L}{2} = 20 \times 10 \times 20 + 4 \times 10 \times \frac{20}{2}$
w = 4400 J

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