1. Not finding help here? Sign up for a free 30min 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!

The Force Exerted by the Ground on a Parachuter

  1. Sep 21, 2008 #1
    1. The problem statement, all variables and given/known data
    A 35.5 kg parachutist lands moving straight downward with a speed of 3.85 m/s.
    (a) If the parachutist comes to rest with constant acceleration over a distance of 0.700 m, what force does the ground exerts on her?

    Variables: Vo, Vf, F, m, a, x
    Known: Vo=3.85 (I think the problem means this as the initial)
    m=35.5 kg
    Vf=0 (don't quite understand the problem)
    x=.7 m

    2. Relevant equations
    Possibly Vf^2=Vo^2+2ax

    3. The attempt at a solution
    I used Vf^2=Vo^2+2ax, and I got 10.5875 m/s^2, multiplied that by 35.5 kg, and I got 375.86 N. WebAssign says the answer is wrong.
  2. jcsd
  3. Sep 21, 2008 #2
    I figured it out. Apparently that is just the force required to stop the object--you must also factor in the weight.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: The Force Exerted by the Ground on a Parachuter
  1. Parachute and Forces (Replies: 2)

  2. Exerted force? (Replies: 1)