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Velocity before stopping

  1. Nov 25, 2007 #1
    1. The problem statement, all variables and given/known data
    a 58kg pole vaulter falls from rest from a height of 5.3m onto a foam rubber pad. the pole vaulter comes to rest 0.38 seconds after landing on the pad

    Calculate the constant force exerted on the pole vaulter due to the collision. Answer in N


    2. Relevant equations

    d = Vi(t) + (1/2)(a)(t²)
    Vf = Vi + (a)(t)

    3. The attempt at a solution

    d = Vi(t) + (1/2)(a)(t²)
    5.3 = 0 + (1/2)(a)(.38²)
    73.4 m/s² = a

    Vf = Vi + (a)(t)
    Vf = 0 + (73.4)(.38)
    Vf = 27.89 m/s
     
  2. jcsd
  3. Nov 25, 2007 #2

    rl.bhat

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    Homework Helper

    d = Vi(t) + (1/2)(a)(t²)
    5.3 = 0 + (1/2)(a)(.38²)
    73.4 m/s² = a
    This is wrong. You have to find the velocity with which he lands on the rubber pad. That is his initial vlocity. And his final velocity is zero..Time is given. Find the retardation and hence the force.
     
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