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A Stiff-Legged Landing

  1. Oct 26, 2009 #1
    1. The problem statement, all variables and given/known data
    When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 72.6 kg man just before contact with the ground has a speed of 6.35 m/s. In a stiff-legged landing he comes to a halt in 2.19 ms. Calculate the average net force that acts on him during this time.

    2. Relevant equations

    3. The attempt at a solution
    I don't even know how to start this one. Please help.
  2. jcsd
  3. Oct 26, 2009 #2
    what is the average acceleration?

  4. Oct 26, 2009 #3
    I don't know. How would you go about solving for it?
  5. Oct 26, 2009 #4
    Average acceleration is [tex] \Delta v / \Delta t [/tex]
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