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Homework Help: Finding energy without mass

  1. Mar 27, 2005 #1
    Is it possible to figure how much energy it takes to push an object with a unknown mass 100 km in the air from earth? I was able to figure the inital velcity required to do so which is 1400 m/s. Any ideas?
  2. jcsd
  3. Mar 27, 2005 #2


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    You'd need the mass...Both in the expression of KE & gravitational potential energy (or work done by gravity forces) the mass of the moving body appears...

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