Physics
Speed Calculator
Find speed from distance and time.
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Calculate average speed from a distance travelled and the time it took.
The math behind it
speed = distance ÷ time. Convert m/s to km/h by ×3.6, or to mph by ×2.237.
Worked Example
100 m in 10 s → 10 m/s = 36 km/h = 22.4 mph.
Frequently Asked Questions
Average vs instantaneous speed?
This gives the average over the whole trip, not the speed at a single moment.
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