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NEET2013PhysicsGravitationActual

A body of mass m taken from the earth's surface to the height equal to twice the radius (R) of the earth. The change is potential energy of body will be

Options

  1. Am g 2 R
  2. B2 3 m g R
  3. C3 mgR
  4. D1 3 m g R

Correct answer

B. 2 3 m g R

Step-by-step solution

Change in potential energy aligned U & =- G M m R+2 R - (- G M m R ) & =- G M m 3 R + G M m R & = 2 G M m 3 R = 2 3 m g R [ g= G M R^2 ] aligned

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