the.com/velocity
speed that knows where it's going, the difference between racing and just running.
means The speed at which something moves, especially measured in a particular direction.
from Straight from Latin velocitas, "swiftness," built on velox, "fast" — the same swift root that sprints through words like velocipede, the early bicycle whose name literally promised "fast feet." English picked it up in the 1500s, and physics later gave it a sharper job, splitting it from plain "speed" by insisting it carry a direction along with the hurry.
- vs speed
- velocity has direction; speed is just the magnitude
- can be zero
- finish where you started, average velocity is nothing
- light's limit
- 299,792 km per second, the universe's hard ceiling
- escape value
- 11.2 km per second frees you from Earth
- word root
- from Latin velox, simply meaning swift
apollo 10 command module — reached 39,897 km/h (11.08 km/s) during re-entry in may 1969, fastest crewed vehicle
parker solar probe — achieved 586 km/s (163 km/s) as of 2021, fastest human-made object orbiting the sun
relativistic jets from m87 — black hole jets reaching 99.5% the speed of light, observed by event horizon telescope