In which of the following applications is work NOT done?

Shopping in the supermarket

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Standing with a basket of fruits on the head

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Climbing a tree to pluck fruits

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Pushing a wheel barrow of bricks

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Solution

The correct option is B Standing with a basket of fruits on the head
Work done is zero when the displacement angle is at 90 degree's i.e Cos $θ$ is zero. Hence this explain why a person standing with a basket of fruits on the head does not do any work. As the man carries the load by lifting it upwards and moves forward it is then obvious that the force applies by the porter and the displacement is 90 degree's.

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