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Homework Help: Just a little help

  1. Oct 19, 2004 #1
    The force required to compress an imperfect horizontal spring an amount x is given by F = 153x + 12.7x3 , where x is in meters and F in newtons. If the spring is compressed 1.96 m, what speed will it give to a 3.15 kg ball held against it and then released?

    I know that I will need to take the integral from x=0 to x=1.95, which gives me 341. How do I now get the velocity from this? Any suggestions?
     
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  3. Oct 19, 2004 #2

    arildno

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    What physical interpretation has "341"?
    What are it's units, in particular: can it be seen as some form of energy?
     
  4. Oct 19, 2004 #3
    I would believe it to be the Force as that is what the function is.
     
  5. Oct 19, 2004 #4

    arildno

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    Force*meter=Force??
    Think again..
     
  6. Oct 19, 2004 #5
    Oh duh that is the Work! So I use W=1/2mv^2!

    Thanks for the help!
     
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