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  1. Sep 20, 2009 #1
    3. You lower a 2.50 kg textbook (remember when textbooks used to be made out of paper instead of being digital?) from a height of 1.81 m to 1.50 m. What is its change in potential energy?


  2. jcsd
  3. Sep 20, 2009 #2


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    Looks good. It is particularly good that you have minus sign, indicating that the book has lost potential energy. To be perfect, give the units.
  4. Sep 20, 2009 #3
    The numbers are OK. I'd put in some units and some text before you turn it in.
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