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Homework Help: Adding Two-dimensional motion

  1. Nov 12, 2009 #1
    I'm having trouble with adding two-dimensional motion. Here's an example of the type of problem I'm having trouble with:

    A map gives you the following directions:

    Travel 45 mintues at a speed of 1.2 m/sec and a heading of 45 degrees. Turn to a heading of 330 degrees and travel at the same speed for 32 minutes.
    What will your displacement be if you follow these directions?

    I was taught to use this equation:
    [tex]\Delta[/tex]x = initial velocity * time + 1/2 * acceleration * time^2
    Ax= initial velocity * cos()
    Ay= initial velocity * sin()
    and the same for the the second vector.

    I started out with trying to find the first vector or vector A as I called it.
    [tex]\Delta[/tex]x= 1.2 m/sec(2700 sec) + 1/2 (0)(2700 sec)^2
    and got [tex]\Delta[/tex]x=3240m which I thought was a bit high, so I don't know if I'm doing something wrong or if it should really be that high.
  2. jcsd
  3. Nov 12, 2009 #2


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    Welcome to PF!

    Hi Gamegoofs! Welcome to PF! :smile:

    (have a delta: ∆ :wink:)
    No, that's ok …

    and it's not high, it's only 3km after nearly an hour! :wink:
  4. Nov 13, 2009 #3
    Thanks so much!
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