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Need help on a Newton's Laws problem

  1. Dec 2, 2007 #1
    [SOLVED] Need help on a Newton's Laws problem :(

    1. The problem statement, all variables and given/known data

    A 56 kg ice skater holds up a large sheet of cardboard that can catch the wind and drive her (frictionlessly) across the ice. While she's moving at 0.5 m/s, a wind that is constant and horizontal for 5.0 s exerts a force on the cardboard of 2.1 N. What is the skater's initial acceleration once the wind begins to blow?

    2. Relevant equations
    a=change in velocity/change in time

    3. The attempt at a solution

    I'm not sure how to find the initial acceleration. I know how to find the average acceleration though.
  2. jcsd
  3. Dec 2, 2007 #2
    Nevermind, figured it out on my own:
    Just have to do: 2.1/56

    >_< why did i think this was hard...
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