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Homework Help: Bungee Jump

  1. Nov 26, 2004 #1
    A bungee jumper with mass 200.0 kg jumps from a high bridge. After reaching his lowest point, he oscillates up and down, hitting a low point eight more times in 30 s. He finally comes to rest 20.0 m below the level of the bridge. Calculate the spring constant of the bungee cord and the unstretched length of the bungee cord.

    How do I approach this problem?
  2. jcsd
  3. Nov 26, 2004 #2
    Well, you know that T = 30/8 = 3.75
    And [tex]T=2\cdot\pi\cdot\sqrt{\frac{m}{k}}[/tex] => k = 561.47[N/m]
    You also know that 20m under the bridge a=0
    [tex]\Sigma \vec{F} = 0[/tex]
    [tex]mg=k\Delta L[/tex]
    Now you just need to get [tex]\Delta L[/tex].

    Last edited: Nov 27, 2004
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