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Homework Help: What are the x- and y-components of the velocity vector?

  1. Oct 1, 2015 #1
    1. The problem statement, all variables and given/known data
    Question is: What are the x- and y-components of the velocity vector shown in the figure?


    3. The attempt at a solution
    I tried -100 m/s*cos(30 degrees)=-86.6m/s for the x component and -100m/s*sin(30 degrees)=-50m/s for the y component, but was incorrect for both. What am I missing?
  2. jcsd
  3. Oct 1, 2015 #2


    User Avatar

    Staff: Mentor

    Welcome to the PF.

    You got the sin & cos backwards. Try drawing the line from the tip of the vector to the negative y axis. See how the component of the vector on the negative y axis involves the cos(30 degrees)?
  4. Oct 1, 2015 #3
    Thanks berkeman, I see what you mean now. I didn't expect something like that. Thank you for the incredibly quick reply.
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