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Homework Help: Acceleration in Two Dimensions

  1. Sep 23, 2012 #1
    1. The problem statement, all variables and given/known data

    A car initially traveling due north goes around a semicircle having a radius of 500 m at a constant speed of 20 m/s. A) How long does this take? B) What is the magnitiude and direction of the average acceleration?

    2. Relevant equations

    a = Δvx/Δt(xhat)+Δvy/Δt(yhat)

    3. The attempt at a solution

    I'm stumped as to how to start this problem. I drew out a half circle with the radius showing 500 m for the distance. I'm not sure if I'm missing a formula or what as I didn't see anything relevant for circles on my formula sheet from my class. Any help is appreciated.
  2. jcsd
  3. Sep 23, 2012 #2


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    Science Advisor
    Homework Helper

    For one thing for motion in two dimensions, acceleration is a vector quantity. It has x and y components. You don't add them. But you didn't do part A yet. What's the Δt?
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