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Homework Help: Work and Energy of carnival dinner

  1. Feb 17, 2015 #1
    1. The problem statement, all variables and given/known data
    At a carnival, you can try to ring a bell by striking a
    target with a 9.00-kg hammer. In response, a 0.4-kg metal piece
    is sent upward toward the bell, which is 5.00 m above. Suppose
    that 25.0% of the hammer’s kinetic energy is used to do the (non-
    conservative) work of sending the metal piece upward. How fast
    must the hammer be moving when it strikes the target, so that the
    bell just barely rings?

    2. Relevant equations
    Work-Energy Theorem

    3. The attempt at a solution

    The answer must be 4.17 m/s
  2. jcsd
  3. Feb 17, 2015 #2


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    Science Advisor
    Homework Helper
    Gold Member

    M2 is not 4kg.
  4. Feb 17, 2015 #3
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