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Change in gravitational energy

  1. Aug 11, 2003 #1
    here's a question.

    a body of mass m at a surface of the Earth is brought to a point a distance 2R ( R = radius of the Earth ) from the centre of the Earth.

    what is the change in gravitational energy of the body. will the gravitational energy of the body increased or decreased?
     
  2. jcsd
  3. Aug 11, 2003 #2

    HallsofIvy

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    What do you mean by the "gravitational energy" of a body? The gravitational potential energy?

    The potential energy changes, in moving from R to 2R, by the work done to move the mass: the integral (from R to 2R) of -GmM/r2 dr= (GmM)/R.
     
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