Question

Calculate the amount of work done in drawing a bucket of water weighing 10 kg from a well of depth 20m.

Answer 1

Mass of bucket - 10kg

Acc. due to gravity - 9.8m/s^2

Height or dept of well - 20m

Since, Force = mass × acc.

Force = 10 × 9.8 = 98N

Now We know that ,

Work = Force × Displacement

Work = 98 × 20 = 1960J

***Therefore amount work done by the bucket is 1960Joule.

Answer 2

NET WORK DONE IS 200 Joule .

Given:

• Weight of bucket = 10 kg
• Depth = 20 m
• g = 10 m/s²

To find:

Work done to lift bucket ?

Calculation:

When the operator is doing work to lift the bucket from the well, work gets stored in the bucket as the gravitational potential energy (because gravitational force is a CONSERVATIVE FORCE)

So, work done is :

$W = gravitational \: potential \: energy$

$\implies W = m \times g \times h$

$\implies W = 10 \times 10 \times 20$

$\implies W = 2000 \: joule$

So, the net work done is 200 Joule.