Question

Which of the following is not an example of zero work?

• A. The work done by the tension in the string, when a body tied with the string move along a circular path.
• B. When a horse pulls a cart on a level road.
• C. The work done by a coolie when he travels on a horizontal platform, with a load on his head.
• D. When a person holds some amount of load but, does not move from his position.

Answer 1

The correct option is B

When a horse pulls a cart on a level road.

When a horse pulls a cart on a level road; he does some work.