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Converting one part of the equation into another

  1. Oct 10, 2008 #1


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    1. The problem statement, all variables and given/known data
    http://img90.imageshack.us/img90/8280/picture1mc2.png [Broken]
    In my answer guide, how do I eliminate h from the beginning part of this equation? Can someone give me hints to fill in the missing gap?

    2. Relevant equations

    3. The attempt at a solution
    I don't know how to get rid of h first. :(
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Oct 10, 2008 #2
    Rearrange one of the expressions so that they are both expressions for h. Then equate them (or just put them together) and you will have eliminated h.
  4. Oct 10, 2008 #3


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    I still don't know how to rearrange them D:
  5. Aug 7, 2012 #4


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    Science Advisor

    If you have never learned algebra, you are going to have a very difficult time through out this course since it clearly assumes you did. The first equation, [itex]h= (1/2)gt^2[/itex] is already solved for h. You can just replace h in the second euation, [itex](2/3)h= (1/2)g(t- \Delta t)^2[/itex] by [itex](1/2)gt^2[/itex]. Or, doing as coffeem suggests, since h is multiplied by 2/3, you can multiply both sides by 3/2 to get rid of that 2/3.
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