20 knots is 10.29 meters per second.
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To convert knots to meters per second, multiply the speed in knots by 0.514444. This conversion factor accounts for the difference in the units of measurement used for speed (nautical miles per hour for knots and meters per second).
33.3km/sec
To convert knots to inches per second, use the conversion factor of 1 knot = 1.68781 inches per second. Multiply the speed in knots by this conversion factor to get the equivalent speed in inches per second.
489 knots is equivalent to approximately 564 miles per hour or 906 kilometers per hour.
The SI unit for tangential speed is meters per second (m/s).