A coolie carries a load of 50kg on his head and walks on a level road up to 100m. what is the work done by him.

The work done would be zero.

Consider the following...

mathematically, work done is written as

W = F.s = FsCosθ


F is the force applied, s is the displacement caused

such that

F = mg = 50 X 10 = 500 N

s = 100 m

and θ is the angle between (vectors) F and s



as F and s are perpendicular, θ = 90o



W = FsCos90 = 0

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