Speed

Just how fast is 20 metres per second?

Road & rail

20 m/s

72 km/hkilometres per hour
44.739 mphmiles per hour
Mach 0.058309Mach
6.6713 × 10⁻⁸ cspeed of light
Equal time
DISTANCE IN ONE SECOND20 m in 1 s20 m in 1 s
01
20 metres per second72 km/hSpeed · definition
02
Land yacht72 km/hDefined fast sailing speed · defined specimen · range 43.2 km/h–108 km/h
Each track shows distance covered in the same second. The small illustrations identify the movers; their sizes are schematic.

A little perspective

The speed of 20 metres per second and the defined fast sailing speed of Land yacht are approximately the same.

Measurements, assumptions & sources +

20 metres per second

The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.

NIST — SI conversion factors

Land yacht

A defined three-wheel racing land yacht 5.5 m long, 3.5 m wide and 200 kg ready to sail, moving at 20 m/s. Racing classes vary; the mast height and pilot mass are excluded from the selected dimensions.

FISLY — International land and sand yachting

The marked defined fast sailing speed is calibrated. Unmeasured illustration details are representative.

Measurement details

Why these numbers?

The visual compares speed with defined fast sailing speed. The records below preserve each value’s basis and caveats.

20 metres per second

72 km/h

Speed · definition

The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.

Land yacht

72 km/h

Defined fast sailing speed · defined specimen · range 43.2 km/h–108 km/h

A defined three-wheel racing land yacht 5.5 m long, 3.5 m wide and 200 kg ready to sail, moving at 20 m/s. Racing classes vary; the mast height and pilot mass are excluded from the selected dimensions.

Comparing
Speed ↔ Defined fast sailing speed
Relative size
The two selected measurements are approximately equal.

How to read the visual

The labelled spans and stored measurements determine the scale; unmeasured illustration details do not.

  • Land yacht uses a 72 km/h central value within a recorded range of 43.2 km/h–108 km/h.
  • Land yacht is labelled defined specimen; treat the displayed value as a comparison anchor rather than false precision.
  • The recorded ranges overlap, so the ordering can vary even though the central values differ.

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