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Spring compression physics problem

  1. Oct 4, 2009 #1
    A 1.5kg object is held 1.2m above a spring with force constant 320N/m. The object is dropped on the spring how far does the object compress the spring?

    Alright so what i did was mgh=0.5kx^2 but the answer is different from the book. I guess is when the object touches the spring, its exerting a force downward to the spring due to gravity so i tried mg(h+x)=0.5kx^2 and solve the equation however this is wrong again.....Can someone tell me whats wrong?
     
  2. jcsd
  3. Oct 4, 2009 #2

    Doc Al

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    Staff: Mentor

    Re: Springs!!!

    That should work just fine. (It's a conservation of energy problem.) Why do you say it's wrong?
     
  4. Oct 4, 2009 #3
    Re: Springs!!!

    So you mean my second attempt is correct? Well, the answer i got is different from the one in my book.
     
  5. Oct 4, 2009 #4

    Doc Al

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    Staff: Mentor

    Re: Springs!!!

    Yes.
    Show what you did and what the book says.
     
  6. Oct 4, 2009 #5
    Re: Springs!!!

    Hey doc my bad. The book uses g=10 instead of 9.81 hence the difference sorry about that. Thanks man!
     
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