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Simple Motion in 2 Dimensions, Have Velocity Compnents, Trying to find Displacement

  1. Oct 3, 2009 #1
    1. The problem statement, all variables and given/known data

    Two forces, vector F 1 = (3 i - 2 j) N and vector F 2 = (4 i - 7 j) N, act on a particle of mass 1.70 kg that is initially at rest at coordinates (-1.70 m, +4.25 m).

    i know that the components of the velocity at 9.4 seconds are (38.7i - 49.7647j)m/s
    i also know that the direction the particle is moving at 9.4 seconds is 307.87 degrees
    2. Relevant equations



    3. The attempt at a solution
    some how everything I do brings me to (363.78i - 467.788j)m which is wrong
     
  2. jcsd
  3. Oct 3, 2009 #2

    tiny-tim

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    Welcome to PF!

    Hi PeterFer! Welcome to PF! :smile:

    You don't need, and shouldn't use, the final velocity …

    (it's misled you into using s = vt)

    just use one of the standard constant acceleration equations

    (and don't forget to add on the initial position). :wink:
     
  4. Oct 5, 2009 #3
    Re: Simple Motion in 2 Dimensions, Have Velocity Compnents, Trying to find Displaceme

    ah yea thank you, i ended up realizing that myself but thank you anyway
     
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