distance
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If you mean kilometres, the answer is distance.
kilometers (km) are a measurement of length. Length cannot be measured by time unless there is an object moving.
The dimensions of a gym would best be measured in metres (m) and not kilometres (km).
== == Given that the circumference of the earth is 40,075.02 km (measured at the equator) the circumference in inches is roughly 1,577,756,664 inches.
Initial velocity can be measured in the same units as any other velocity. In SI, that would be meters per second, but often km / hour are used, or (in a minority of countries) feet/second or miles/hour.