Question

how much work is done by a coolie to carry a load of weight 500 newton on head to a distance of 1 km?

Answer 1

Work done by a coolie to carry a load is zero because there is no displacement in the direction of force applied by him.

i.e.

W = Fs cosθ

Here, θ = 90⁰

So, W = 500 *1000*cos90⁰

=> W = 500*100* 0 = 0