In which of the following activities, work is not done?

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Suma is swimming in a pond

A donkey is carrying a load on its back

A windmill lifting water from a well

An engine is pulling a train

answer is B.

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Detailed Solution

A donkey is carrying a load on its back work is not done.
In this case, the force of gravity on the load is acting in the downward direction, whereas the displacement will be in the horizontal direction i.e., the force and displacement are perpendicular to each other. There is no displacement in the direction of the force of gravity, and therefore no work is done as there is no displacement in the direction of the force.
The donkey applies force on the load in the vertical direction whereas the motion is in the horizontal direction. Since the displacement is perpendicular to the force applied, no work is done.