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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To convert 21 meters per second to mph, you can use the following conversion factors: 1 meter per second is approximately equal to 2.237 mph. Therefore, 21 meters per second is approximately 47.25 mph.
Just divide the distance (in meters) by the time (in seconds).
21 square feet.
21 x 21 = 441 square feet
7 yards is equal to 21 feet.