If you divide the total distance traveled on a car trip (as determined by the odometer) by the time for the trip, are you calculating the average speed or the magnitude of the average velocity? Under what circumstances are these two quantities the same?
A. We are calculating the average speed. The average speed and the acceleration will be the same if the movement is not in a straight line from beginning to end.
B. We are calculating the average speed. The average speed and the average velocity will be the same if the movement is in a perfect straight line from beginning to end.
C. We are calculating the instantaneous speed. The average speed and the instantaneous momentum will not be the same if the movement is in a perfect circle from beginning to end.
Answer: B. We are calculating the average speed. The average speed and the average velocity will be the same if the movement is in a perfect straight line from beginning to end.
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