Example 1
120 km travelled in 1.5 h corresponds to 80 km/h.
Mendeleev
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Physics tools › Speed, distance and time
Mendeleev · Physics
Speed, distance and time
Average speed compares the distance travelled with the elapsed time. It does not describe every instant of the motion unless the speed is constant.
Formula usedv = d / t
Calculate
Speed, distance and time
What do the symbols mean?
ddistance
vspeed
Δtelapsed time
Two worked examples
Example 2
At 5 m/s, covering 400 m takes 80 s, or 1 min 20 s.
Good to knowElapsed time may be written t or Δt depending on context.