A body of mass m is moving with a uniform velocity u. A force is applied on the body due to which its velocity increases from u to v. How much work is being done by the force?

State the work–energy theorem.

Name the form of energy which a body may possess even when it is not in motion. Give an example to support your answer.

Write an expression for the potential energy of a body of mass m placed at a height h above the earth’s surface. State the assumptions made, if any.