EVERYDAY SCIENCE

Detailed explanation-1: -If you move, you have kinetic energy associated with that motion, and the amount of energy you have depends on the speed at which you are moving. So to find KE from v or vice versa is merely a way of restating information that you already have.

Detailed explanation-2: -A running man has the same kinetic energy as that of a boy of half his mass. The man speeds up by 2 m/s and the boy changes his speed by x m/s so that the kinetic energies of the boy and the man are again equal.

Detailed explanation-3: -If a runner is ready for a race and is in the starting blocks, then the energy it has is potential energy. However, once he starts to run, this potential energy stored in the running muscles is converted into kinetic energy.

Detailed explanation-4: -Every moving object and particle have kinetic energy. A person walking, a soaring baseball, a crumb falling from a table and a charged particle in an electric field are all examples of kinetic energy at work.