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speed, average speed

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If s is the length of the path (also known as the distance) travelled until time t, the speed equals the time derivative of s:

v = ds/dt

In the special case where the velocity is constant (that is, constant speed in a straight line), this can be simplified to v=s/t. The average speed over a finite time interval is the total distance travelled divided by the time duration.

v = s/t

*** Âü°í¹®Çå[References] ***

https://en.wikipedia.org/wiki/Speed#Average_speed
v = s/t
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