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Homework Help: Rearranging an equation

  1. Jan 19, 2013 #1
    Just need some help rearranging this equation to make M the subject, thanks

    v = sqrt 2kt / m
  2. jcsd
  3. Jan 19, 2013 #2


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    Homework Helper

    Start by squaring both sides.
  4. Jan 19, 2013 #3
    sqrt v = sqrt 2kt / m
  5. Jan 19, 2013 #4
    m = 2kt / v^2
  6. Jan 19, 2013 #5


    Staff: Mentor

    I see two mistakes in what you did:
    1. rock.freak667 said to square both sides (not take the square root of both sides).
    2. He said to do it to both sides, not just the left side.
  7. Jan 21, 2013 #6


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    Science Advisor

    If the problem is v= sqrt(2kt/m) then, yes, start by squaring both sides to get rid of the square root.

    If the problem is v= sqrt(2kt)/m, which is the way I first interpreted it, start by multiplying both sides by m.

    Please use parentheses to make your meaning clear!
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