First slide
Gravitaional potential energy

The work done to raise a mass m from the surface of the earth to a height h, which is equal to the radius of the earth, is


Work done =Change in potential energy


where  M is the mass of earth and R  is the radius of earth.

 W=GMm1R-1(R+h)  Now, h=R W=GMm1R-12R=GMm2R  W=mgR2                                                  g=GMR2

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