Consider a circular track with a radius of 200 meters. A runner starts on the east side and runs around the track to a point diametrically opposite her starting point.

-What is the magnitude of her displacement?

-She then runs the rest of the way around the track to complete full lap. What is the magnitude of her total displacement after she has returned to her starting point?

-Suppose the runner takes 2 minutes to run from her starting point to the opposite side of the track. What is the magnitude of her average velocity over the 2 min interval?

-What is her average speed over the same interval?

(Are my answers correct?)

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  1. correct

  2. Thanks! so the 100m/min is right?

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