What do you understand by the kinetic energy of a body?

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?

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.

A light mass and a heavy mass have equal momentum. Which will have more kinetic energy?