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Adding Forces Problem

  1. Sep 21, 2008 #1
    1. The problem statement, all variables and given/known data
    Three forces given, by F1=(-2.00i + 2.00j)N, F2=(5.00i - 3.00j)N, and F3=(-45.0i)N
    act on an object to give it an acceleration of magnitude 3.75 m/s2.
    (a) What is the direction of the acceleration?
    (b) What is the mass of the object?
    (c) If the object is initially at rest what is its speed after 10.0s?
    (d) What are the velocity components after 10.0s?

    2. Relevant equations
    I added the forces together and get (-42.0i + 5.00j)
    I found the hyp of the triangle x=43 and y=5 to be 42.3

    3. The attempt at a solution
    (a) Tan-1 (5/42) = 6.7 or 173 degrees
    (b) m=F/A m= 42.3N/3.75m/s2 = 11.3kg

    Am I doing this correct so far?
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
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