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When a coolie walks on a horizontal platform with a load on his head, the work done by the coolie on the load is zero.

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When a coolie walks on a horizontal platform with a load on his head, the work done by the coolie on the load is zero.

(a) True

(b) False

I got this question in a job interview.

The question is from Work, Energy and Power topic in division Nature of Physical World of Engineering Physics I

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The correct option is (a) True

The explanation is: When a coolie walks on a horizontal platform with load on his head, he applies force in the upward direction equal to its weight. The displacement of the load is along the horizontal direction. Thus the work done by the coolie on the load is zero.

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