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Homework Help: Calculating Force problem

  1. May 28, 2016 #1
    1. The problem statement, all variables and given/known data
    A high jumper with a body weight of 800N exerts a force of 3 kN against the ground during takeoff.
    How much force is exerted by the ground on the high jumper?

    2. Relevant equations
    f=m x a
    3. The attempt at a solution
    I converted 800n in to KN giving me 0.8

    I then divided a=3kn/0.8kn

    is this right?

    if not, how do i fix the issue
  2. jcsd
  3. May 28, 2016 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Hint: It's a trick question! (Consider Newton's 3rd law.)
  4. May 28, 2016 #3
    so 3kn, because every action has equal and opposite reaction. thank you
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