A mass of 10 kg is at a point A on a table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your answer.

We know that, \( W \ = \ m g h \)

\(\because \) Body is moved only in horizontal direction.

\(\therefore \) Vertical displacement, h = 0

\(\Rightarrow W \ = \ mg \ × \ zero \ = \ 0 \)

Therefore the work done on the body by gravity is zero.