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Homework Help: Physics Homework Problem-Stuck?

  1. Mar 4, 2005 #1
    Physics Homework Problem--Stuck?

    A 75 kg water skier is being pulled by a horizontal force of 495 N and has an acceleration of 2.0 m/s2. Assuming that the total resistive force exerted on the skier by the water and the wind is constant, what force is needed to pull the skier at a constant velocity?


    I tried doing this to solve the problem:

    F=ma
    F=75kg x 2.0= 150N

    Then I added 150 and 495 to get 645 N but this is not the right answer.

    Can someone please tell me what I did wrong?
     
  2. jcsd
  3. Mar 4, 2005 #2

    dextercioby

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    Homework Helper

    What is the total resistive force...?

    Daniel.
     
  4. Mar 4, 2005 #3
    [tex]F_{net} = ma[/tex]

    This stands for the net force.. not only one. Draw a force diagram and see where each one is going.
     
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