Question

A coolie standing at a station with a luggage on his head. He stands still at one place does he do some work. If then why and if yes then why?

Answer 1

No there is no work done against the force of gravity because the displacement and the direction of force are at an angle of 90°.

Explanation:

Walking involves doing the same amount of work against gravity as standing, because the weight of the body is the same.

So, the coolie does work against gravity equal to the total weight he is carrying (his body weight and the weight of whatever he is wearing, carrying, etc).

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Answer 2

no, because the angle made by Coolie is 90°with the station
work=force*displacement*cos theta
cos 90=0
work=0