Question

How does the kinetic energy of a moving body depend on its.
i) speed
ii) mass​

Answer 1

Hence, kinetic energy is directly proportional to mass of the body and directly proportional to the square of the speed of the body.

Answer 2

Kinetic energy, form of energy that an object or a particle has by reason of its motion. ... Relativistic kinetic energy is equal to the increase in the mass of a particle over that which it has at rest multiplied by the square of the speed of light. The unit of energy in the metre-kilogram-second system is the joule.