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Posted by on Friday, November 6, 2009 at 10:19am.

If a 40 kg brick and a 400 kg brick each dropped from 1 m above a trampoline, find the lowest position of each brick. Assume the trampoline is a simple spring obeying Hooke's law with a k value of 12 000 N/m.

I know i must use Fs= kx,
but where do I start?
Do i find Fg at 1 m?

  • Physics - , Friday, November 6, 2009 at 10:26am

    I would do it with energy.

    mg(h+x)=1/2 k x^2
    then solve for x in each case.

  • Physics - , Friday, November 6, 2009 at 10:29am

    okay, but what is the start of that eq'n?
    It looks similar to Eg=Ek ?

  • Physics - , Friday, November 6, 2009 at 10:31am

    PEintrampoline=PE gravity lost

  • Physics - , Friday, November 6, 2009 at 10:37am

    pe= potential energy?

  • Physics - , Friday, November 6, 2009 at 10:38am

    and how do i solve for x when it is on oth sides of the eq'n?

  • Physics - , Friday, November 6, 2009 at 10:39am

    multiply it all out, you will get a quadratic equation. Use the quadratic formula.

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