Answer:
Work done by gravitational force = 0 joule
Step-by-step explanation:
Work done is given by the relation
W = F x S joule
Where, F - the force applied in the form of push or pull
S - displacement caused by the force
If a force is acting on a body and it doesn't cause any displacement, then work done will be zero.
Gravitational force acts on the body even if the body is at rest.
Work done by the gravitational is applicable only if there is some vertical component of motion involved.
In this case, some amount of work is done to move the body from point A to B.But, the body is displaced in the horizontal direction. No vertical motion is involved.
So, the work done due to gravitational force on a mass is zero joule.