Question

If a body of mass 'm' is on the surface of Earth . Then Find it's total energy of the body ? In what form the energy is present in the body ? What is the kinetic energy of the body ?
What is the potential energy of the body ?​

Answer 1

Explanation:

The gravitational potential energy at a height h is

Uh= -GMem/ Re + h

If h = Re » Uh = -GMem/ +2Re = - mgRe/2

& the gravitational potential energy on the surface of the earth is Us = - GMem / Re

So change in potential energy ∆U = Uh - Us

= -GMem/2Re + GMem/Re = GMem/2Re

∆U = mgRe/2

it means that to move a body of a mass m from the surface of earth to a height h = Re, the energy required is GMem /2Re = mgRe/2