Question

A Coolie carrying a load on his head and moving on a horizontal platform does no work. Explain the reason, Why?​

Answer 1

Answer:

Explanation:

there is no work because the angle between the force applied ( vertically upwards) and displacement of the  load (along the horizontal) is 90°

using the formula

W = Fd cos θ

W = Fd cos 90° = 0

Answer 2

Answer:

There is no work because the angle between the force applied and the displacement of the load is 90.

Explanation: