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Homework Help: The relative motion

  1. Nov 11, 2008 #1
    1. The problem statement, all variables and given/known data
    suppose the boat is initially at x = 0, y = 0. and the dock is located at x = 55 m, y = 11.7 m relative to this starting point. Assume that the speed of the boat relative to the water is 5.0 m/s and that the speed of the water relative to the ground is 1.4 m/s.
    (a) At what angle relative to the x-axis must the boat be pointed in order to reach the other dock?
    (b) With the angle found in part (a), what is the speed of the boat relative to the ground?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Nov 11, 2008 #2


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    Homework Helper

    Welcome to PF!

    Hi omerr! Welcome to PF! :smile:

    Hint: velocity is a vector, so velocities obey the law of vector addition.

    So draw a vector triangle (and tell us what you get). :smile:
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