Velocity is a vector quantity — it has both magnitude (speed) and direction. Average velocity = displacement / time. Instantaneous velocity = rate of change of position at a moment. Unlike speed, velocity can be negative (opposite direction).
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Pro Tip
Velocity vs speed: speed is scalar (always positive), velocity is vector (can be negative). If you drive 100 km north then 100 km south, speed = 200 km but displacement = 0 and average velocity = 0.
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Did You Know?
The fastest human-made object is the Parker Solar Probe, which reached 635,000 km/h (0.064% the speed of light) in 2023. By comparison, the International Space Station orbits at 27,600 km/h, and a rifle bullet travels at ~3,600 km/h.
References
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