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Problem with average velocity in a circle

  1. Sep 28, 2004 #1
    A particle P travels with constant speed in a circle of radius 7.4 m and completes one revolution in 22.0 s (see Figure). The particle passes through O at t = 0 s. What is the magnitude of the average velocity during the interval from t = 4.4 s and t = 18.7 s.

    I used T=2(pi)r / v

    22 = 2*pi*7.4/v
    v = 2.11 m/s

    But the answer was rejected... The velocity in a circle is supposed to be constant, why won't my answer work?
     
  2. jcsd
  3. Sep 28, 2004 #2

    Doc Al

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    Staff: Mentor

    The speed is constant, not the velocity.
     
  4. Sep 28, 2004 #3
    Oh man... Does that mean my answer is just negative since it's moving counterclockwise?
     
  5. Sep 28, 2004 #4

    Doc Al

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    Staff: Mentor

    find the displacement

    No. I suspect they want you to find the net displacement of the particle from t = 4.4 s to t = 18.7 s. Find out where it is on the circle at those two points, and then figure the displacement. The "average velocity" will be the net displacement divided by the time.
     
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