Question

A coolie A takes 1 minute to lift a load to the roof of a bus, whereas coolie B takes 2 minutes to lift the same load to the roof of the same bus. The work done by B is ______.

Options

• equal to work done by A.

• greater than work done by A.

• less than work done by A.

• none of the above.

Answer 1

A coolie A takes 1 minute to lift a load to the roof of a bus, whereas coolie B takes 2 minutes to lift the same load to the roof of the same bus. The work done by B is equal to work done by A.

Explanation:

Work done in lifting a load depends only on the force and the vertical displacement, not on time. Both coolies lift the same load to the same height, so the work done by B is equal to that done by A. Time affects power, not work.