Question

when Do we say the work is done

Answer 1

work is said to be done when the body moves in the direction of the force applied.
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Answer 2

Hey there!

We know,

Work = force * displacement

Here,

work ∝ force and work ∝ displacement

So, we can say that work is done when :

a) A force of certain magnitude acts on body

b) the body is displaced from it's initial point due to action of force.

Hope It Helps You!