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Calculate height and velocity given kinetic and potential?

  1. Jun 21, 2016 #1
    1. The problem statement, all variables and given/known data
    I have a table that needs to be filled out. In each column, potential and kinetic energy are given, but height and velocity are left blank. Ex: PE = 20 J, KE = 0 J, h = ?, V = ?

    2. Relevant equations
    KE = 1/2mv^2
    U = mgh

    3. The attempt at a solution
    I'm totally stumped. How can I figure out either of these with no mass given?
  2. jcsd
  3. Jun 21, 2016 #2


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    Could you simply write height as a multiple of mass?
    i.e. if PE = 20J ##h = \frac{20}{9.8 m} ## where m is in kg.
  4. Jun 21, 2016 #3


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    Gold Member

    Forum rules require you to post the question word for word.
    You should be able to do that one.

    As for the other entries in the table... Do they relate to the same object at different times? Perhaps try applying conservation of energy between two rows in the table.
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