Question

What are conditions for work done to be zero?

Answer 1

work =FS costheta
w=m*a*cos theta
so if mass is 0

acceleration is 0

displacement is 0

theta is 90

Answer 2

Work done is said to be zero when force applying to the body is zero or the Displacement done by body pic zero. if the value that means force acting on body is perpendicular then the force acting will be equals to zero.

hope it is helpful to you.