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Homework Help: Spring problem on work and force

  1. Feb 2, 2014 #1
    1. The problem statement, all variables and given/known data

    a .4 kg mass compresses a spring of .2m. The spring constant is 400n/m How fast is the mass moving after the mass is released and the spring uncompresses? If the mass is going up a .5m hill, how fast is it going?

    2. Relevant equations




    3. The attempt at a solution

  2. jcsd
  3. Feb 2, 2014 #2
    To find how fast its moving right after the spring decompresses, use energy conservation. Elastic potential energy is lost, and kinetic energy is gained.

    You'll have to clarify the second part -- is the hill 0.5m high? Do you mean how fast is it going at the top?
  4. Feb 2, 2014 #3
    The hill is .5m high
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