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A jogger runs around a circular track of 30 m radius shown in the figure at the right. She runs at a constant speed in a clockwise direction and completes one lap in 40 seconds. Compare the directions and magnitudes of her instantaneous velocity at A, her instantaneous velocity at C, and her average velocity going from A to C.

2. If the runner completes exactly one lap what is her average speed? her average velocity? Explain your answer.

3. Is the magnitude of her average velocity from A to B bigger, smaller or equal to the magnitude of her average velocity from A to C? Explain your reasoning.
4. For this example, which do you think is more relevant: average speed or average velocity? For whichever one you chose can you think of an example in which the other one is more relevant or interesting?

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Page last modified August 31, 2004: K06