Question

The nature of work done by a boy in carrying a
box on his head and moving on a frictionless
horizontal surface is
Zero
Positive
Negative
May be positive, negative or zero​

Answer 1

Answer:

Gravitational force on the box is acting in the downward direction. Since the boy walks horizontally, his vertical displacement is zero. Hence, when a boy carrying load on his head moves over a horizontal road, work done against gravitational force is zero.

Explanation:

Answer 2

Answer:

Gravitational force on the box is acting in the downward direction. Since the boy walks horizontally, his vertical displacement is zero. Hence, when a boy carrying load on his head moves over a horizontal road, work done against gravitational force is zero.

Explanation: