Classify each of the following as descriptive of an object's speed or velocity.
When an object travels once around a circle at a constant rate of 20 m/s, the
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is zero.
When an object travels once around a circle at a constant rate of 20 m/s, the
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is 20 m/s.
When an object travels 8 meters north in 4 seconds and then 4 meters south in 2 seconds, the
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is 2 m/s.
When an object travels 8 meters north in 4 seconds and then 4 meters south in 2 seconds, the
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is 0.67 m/s.