A body carrying a box on his head is walking on a level load from one place to another on a straight is doing no work. This statement is

A person carrying a box on his head is walking on a level road from one place to naother on a straight road is doing no work . The statement is ………….

How do the living beings go from one place to another ?

Consider the situation - A laborer carrying bricks on his head on a level road from one place to another. Find the work done in the process (a) by gravity, (b) by man (c) by frictional force between man and ground.

A coolie with load on his head is walking on a horizontal platform. What is work done against gravity.