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Homework Help: What is the magnitude of the average velocity v of the car?

  1. Feb 27, 2015 #1
    1. The problem statement, all variables and given/known data
    A car is traveling a road that makes quarter of a circle with a constant speed s. What is the magnitude of the average velocity v of the car?

    2. Relevant equations

    3. The attempt at a solution
    this is what I have down but im not sure if I am right
    *constant speed formula
    s=delta x/delta t
    delta x=s(delta t)

    *magnitude formula
    |v|=squareroot x^2 + y^2

    *average velocity
    V=delta x/delta t
    V=delta x/ delta t
    V=s(delta t) / delta t
  2. jcsd
  3. Feb 27, 2015 #2


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    2017 Award

    Staff: Mentor

    You are mixing different lengths here, the x (and y) for the difference in position and the motion along the circle. And you use the same variables for the magnitude of v which makes things even more confusing.

    It is convenient to introduce the radius r of the circle. What is the path traveled by the car? At speed s, how long will it take?
    How far away from its original position is it afterwards?
  4. Feb 28, 2015 #3

    Suraj M

    User Avatar
    Gold Member

    I hope you mean displacement when you say ##x## you can find the arc length as you know the speed of the car as ##s## and you now the angle covered 90degrees so from that you can find the displacement of the car, and then enough can do the rest.
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