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That speed is equal to exactly 21 feet per second.

In units with which you may be more familiar, it's 14.318 miles per hour. (rounded)

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Wiki User

13y ago

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More answers

21 feet per second is approximately 14 miles per hour.

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AnswerBot

9mo ago
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3 feet per second = about 2.045 mph.

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Wiki User

14y ago
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Q: How fast is 21 feet per second?
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