In which of the following situations the amount of work done is zero?

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A person was pushing a huge rock but the rock didn’t move.

A bullock pulling a cart up to

2 km

on road.

A girl pulled a shopping cart about

5 m

away.

Water is delivered to the tank by the water pump.

answer is A.

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Detailed Solution

The amount of work done is zero in a situation where a person was pushing a huge rock, but the rock didn’t move.
There is no work done if the displacement is zero. If the object on which force is applied does not change its position, then the amount of work done is always zero. For example, in option one, a person was pushing a huge rock, but the rock didn’t move. In this situation, the displacement of objects is zero, and the work done is also zero.

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