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Homework Help: Work done by spring

  1. Feb 16, 2009 #1
    1. The problem statement, all variables and given/known data
    A mass of 0.103 kg hangs from a spring. you pull the mass down and has a speed 3.60 m/s. The mass moves down .10 m.
    What was the work done by the earth?
    When the mass moved downward, it slowed down to 2.66 m/s. What was the work done by the spring.

    2. Relevant equations
    Work done by earth = m*g*d
    Work done by spring = 1/2 m*[tex]\Delta[/tex]v2?

    3. The attempt at a solution
    I got the work done by the earth to be 0.10094 J.
    I can't seem to get the work done by the spring. Is that the right formula? Am i suppose to take the rest energy of the spring and add that to the work done by the Earth?
  2. jcsd
  3. Feb 16, 2009 #2
    Use conservation of energy problem [tex]E_i = E_f[/tex] to determine work done by the spring.
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