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Block falls on spring

  1. Oct 18, 2009 #1
    1. The problem statement, all variables and given/known data
    A block is dropped onto a spring with k = 31 N/m. The block has a speed of 3.5 m/s just before it strikes the spring. If the spring compresses an amount 0.11 m before bringing the block to rest, what is the mass of the block?



    2. Relevant equations
    0.5mv^2=0.5kx^2


    3. The attempt at a solution0.5m3.5=0.5*31*.11
     
  2. jcsd
  3. Oct 18, 2009 #2

    Delphi51

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    Homework Helper

    Looks like you forgot to square the 3.5 and the .11.
     
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