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Homework Help: A question regarding power and hookes law

  1. May 5, 2010 #1
    1. The problem statement, all variables and given/known data

    A 2.8 m high spring has a spring constant of 12 N/m. How much power is required if the spring is compressed 1.2 m in 2.5s?

    2. Relevant equations

    Pe= 1/2kx^2

    Power= W/t

    3. The attempt at a solution

    =1/2(12)(1.2)^2
    =8.64 J

    so... Power = 8.64/2.5

    = 3.456 watts

    is this correct? thanks in advance!
     
  2. jcsd
  3. May 5, 2010 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Looks good to me.
     
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