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Speed is formally defined as the rate of change of distance with regard to time. v = ds/dt This v is the instantaneous speed and the notation involves some knowledge of calculus. However, if we only want to calculate an average speed vavg, the following formula can be used: vavg = Δs/Δt where Δs is the change in distance over a period of time Δt. For example, if Joe travelled 30 m in 10 s, his average speed is: vavg = 30 m / 10 s = 3 m/s

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