Question

A man carrying a luggage walks on a horizontal road with a constant velocity. Is he doing work? Why?

Answer 1

no the man is not doing work as the force and displacement should not be perpendicular w= F.d(cos theta) if theta is 90 degrees then no displacement

Answer 2

yes the is doing work because he is walking horizontal road with a constant velocity.. when a object is in motion it said be work done. so the man is doing work by carrying a laggague