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Gravitational potential

  1. Apr 30, 2007 #1
    There is a graph saying that at r=1.0 is the center of the moon..

    A satellite of mass 1500 kg is launched from the surface of the planet. Determine the minimum kinetic energy at launch the satellite must have so that it can reach the surface of the moon.

    The surface of the moon is r= 0.96.
    mass of the planet is 2398800599 kg

    To find minimum kinetic energy would you use:

    -GMm/r or GMm/2r ?

    And wouldn't finding the potential energy equal the kinetic energy?
    why or why not caus ei get two different answers
  2. jcsd
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