Question

A coolie is carrying a heavy load on his shoulders and walking normal to the surface of the earth. What will be the work done by him against gravity? Explain

Answer 1

No work is done because force of gravity is perpendicular to the displacement of the luggage.


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Answer 2

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● The work done will be zero because a coolie carries a load make an angle of 90 degree wherever the 90 degree created the work done will be zero.

Proof:

W = FS Cos Q

W = FS Cos (90°)

W = FS (0)

W = 0