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Verticle Wave Problem

  1. Nov 28, 2003 #1
    A load of mass .2 kg is hanging from a light spring whose elastic constant is 20 N/m. The load is pulled down .1 m from its equilibrium position and released.

    How long is required for the load to reach its equilibrium position?

    This is what I did:
    T=2π(sqrt(m/k))=.628 s

    my friend said the answer should be a fourth of that value, which is .157 s.

    Is my friend correct?

    Please help
  2. jcsd
  3. Nov 28, 2003 #2
    Your friend is correct. The period you calculated is for one complete oscillation (that is, if the mass went pass equilibrium position, reached a stopping point, turned around, went pass equilibrium position again, and arrived at where you started from). From the stretched position, to get to equilibium requires 1/4 of a complete oscillation.
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