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Homework Help: Falling brick speed - equation needed

  1. Jul 9, 2007 #1
    I have a question in my work book that I cannot solve as I can't find the correct equation. The question is:

    What speed will the brick have after falling through a distance of 20 metres? U= at rest. There are no other constants given. What equation would I use to solve this problem?

    (I have looked in the back of the book and the answer is:19.8 m/s)

    Thanks,
    Cat.
     
  2. jcsd
  3. Jul 9, 2007 #2
    Think conservation of energy. Compare the initial and final energies at each state and equate them.
     
  4. Jul 9, 2007 #3

    rem

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    v**2=u**2+2as
     
    Last edited: Jul 9, 2007
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