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Homework Help: I know f=ma but I need velocity

  1. Sep 25, 2012 #1
    While two forces act on it a particle is to move at the constant velocity v= (3m/s)I - (4m/s)j. One of the forces is F1=(2n)I +(-6n)j what is the other force?

    I want to say (1n)I + (2n)j but then I couldn't decided why that would be true. I guess I liked those numbers because if the mass were 1kg it would make the acceleration fit the requirements, I don't think I'm thinking about it correctly.
  2. jcsd
  3. Sep 25, 2012 #2


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    Have a think about how Newtons first law would be applied to this situation.
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