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NEET2019PhysicsGravitationActual

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:

Options

  1. Am g R
  2. B2 m g R
  3. C1 2 m g R
  4. D3 2 m g R

Correct answer

C. 1 2 m g R

Step-by-step solution

W = U f - U i = - G M m 2 R - - G M m R = G M m 2 R W = 1 2 m g R ∵   G M R 2 = g

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