1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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

    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


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted