21 kilometers per hour in feet per second
Conversion
21 kilometers per hour is equivalent to 19.1382327209099 feet per second.[1]
Conversion in the opposite direction
The inverse of the conversion factor is that 1 foot per second is equal to 0.0522514285714286 times 21 kilometers per hour.
It can also be expressed as: 21 kilometers per hour is equal to feet per second.
Approximation
An approximate numerical result would be: twenty-one kilometers per hour is about nineteen point one four feet per second, or alternatively, a foot per second is about zero point zero five times twenty-one kilometers per hour.
Footnotes
[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).
Results may contain small errors due to the use of floating point arithmetic.