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Homework Help: Calc based- motion in 2 and 3 dimensions

  1. Oct 18, 2008 #1
    1. The problem statement, all variables and given/known data
    A train at a constant 79.0 km/h moves east for 25 min, then in a direction 37.0° east of due north for 18.0 min, and then west for 54.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of its average velocity during this trip?

    2. Relevant equations
    Apparently I don't know.

    3. The attempt at a solution
    I really have no idea where to even start.
  2. jcsd
  3. Oct 18, 2008 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    It's always best to start by splitting the motion into perpendicular components, in this case eastward components and northward components.

    Please be aware that we will help you solve this problems, but you are expected to make a decent attempt at them yourself. "I don't know where to start" isn't really a decent attempt, you can look at examples in your notes or textbook for example.
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