Question

A man moves horizontally carrying a load on his head then the work done is

Answer 1

Answer:

no work is done because angle between force and displacement is 90° and therefore

work done = f×scos 90°=0

in other words

no displacement has done in direction of force

Answer 2

Here work done is zero by a man2. Work done = Force x displacement W = F.s = Fs cos θ where θ is the angle between the direction of force and the direction of displacement of the object. If they are perpendicular to each other θ = 90°. We have cos 90° = 0. Therefore W = Fxsx0 = 0

Hope this answer helps u