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Homework Help: Magnitude of Force

  1. Feb 9, 2012 #1
    1. The problem statement, all variables and given/known data
    "A force was used to push a 10 kg object through a distance of 11 metres. Its speed was initially 2 m/s, and was increased to 5.2 m/s at the end of the 11 metres. What was the magnitude of the force?"

    2. Relevant equations
    Ek = 1/2 mv^2
    W = fd?

    3. The attempt at a solution

    Initial kinetic energy was 20, final = 143. 123 J of work went into the system. Unsure of what to do from here, or if that was the correct approach. We're reviewing "work and energy" chapter in class, so I would assume it would be along those lines. multiple choice options are 10.5 N, 115 N, 230 N, 23 N.
  2. jcsd
  3. Feb 9, 2012 #2


    User Avatar

    Staff: Mentor

    You know the amount of work that was done and you know the distance the force acted to do that work.
  4. Feb 9, 2012 #3
    Oops. I see my mistake, I was dividing 123 by 11, 143 J at 5.2m/s isnt correct, it's actually 135. Thanks.
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