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Escape Velocity

  1. Jul 18, 2016 #1
    Why does a planet's kinetic energy become 0 when it reaches infinity? And why does a planet's kinetic energy get converted to gravitational potential energy when subjected under another planet's gravitational field?
    Escape velocity seems very abstract to me!
  2. jcsd
  3. Jul 18, 2016 #2


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    Staff: Mentor

    That is the definition of the escape velocity. If the kinetic energy is still positive then the object was faster than the escape velocity, if the object cannot reach infinity then it was slower.
    That's how the potential energy is defined: the possibility to get converted to kinetic energy.
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