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Circular Motion Question

  1. Dec 15, 2015 #1
    1. The problem statement, all variables and given/known data
    A car travels on a circular track at 20m/s. The track has a circumference of 2.0km. What is the average velocity of the car over one lap?

    2. Relevant equations


    3. The attempt at a solution
    Since the car is travelling at a constant speed of 20m/s, wouldn't the average velocity be 20m/s? The answer key says 0.
     
  2. jcsd
  3. Dec 15, 2015 #2
    Cannot you imagine why 0 is a valid answer?
     
  4. Dec 15, 2015 #3

    gneill

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    Staff: Mentor

    Check the definitions of average velocity and average speed.
     
  5. Dec 15, 2015 #4
    Oh, my bad. Since the car arrives back at the same location, there is no change in displacement and thus, average velocity is 0.
     
  6. Dec 15, 2015 #5

    gneill

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    Staff: Mentor

    Yessir! :oldbiggrin:
     
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