Question

A boy carrying a box on his head is walking on a level road from one place to another on a straight road is doing no work against gravity.

• A. True
• B. False

Answer 1

The correct option is A True

The force of gravity is perpendicular to the direction of displacement of the boy.

Work = force $\times$ displacement in the direction of force

In this case, displacement is zero along with the force because the boy is moving horizontally and the force($mg$) acting downward.

Hence, zero work is done.