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Free Fall and Final Velocity

  1. Feb 5, 2016 #1
    1. The problem statement, all variables and given/known data
    The Drop Zone drops riders 27m from rest before slowingthem to a stop. How fast are they moving before they start slowing down?

    vf=? vi=0, di=27m[up], df=om, displacement=27m[down], acceleration=9.8m/s^2[down] Air resistance is negligable
    2. Relevant equations
    vf^2=vi^2+2(acceleration)(displacement)

    3. The attempt at a solution
    I already figured this out and got the right answer(23 m/s), but in this question, the final velocity isn't 0m/s. That confuses me, because the final position is when they are on the ground- shouldn't the final velocity be 0m/s.
     
  2. jcsd
  3. Feb 5, 2016 #2

    SteamKing

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    Key word: How fast are they moving before they start slowing down? If the riders have a velocity of 0 m/s on the ground, they have come to a complete stop.
    You can't move from A to B at 0 m/s.
     
  4. Feb 5, 2016 #3
    That makes sense. Thank you.
     
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