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Homework Help: Dynamics- Relative Motion Problem

  1. Sep 20, 2012 #1
    1. The problem statement, all variables and given/known data
    Knowing that the velocity of block B with respect to block A is
    vB/A = 5.6 m/s at 70°, determine the velocities of A and B.

    BcDWs.jpg

    2. Relevant equations
    vB/A = vB - vA


    3. The attempt at a solution
    I break down the vectors into their rectangular components

    vB = vB(x) + vB(y)

    vA = vA(x) + vA(y)

    vB/A(x) = vB(x) - vA(x)

    vB/A(y) = vB(y) - vA(y)

    but I end up with 2 unknowns in the equations.
    I probably have to find the angle θ(b) but I have no idea how
     
    Last edited: Sep 20, 2012
  2. jcsd
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