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一般に,「速度」の語があてられるが,物理では速度の大きさを与えるスカラ量のことで,「速度」とは区別して「速さ」と呼んでいる.
出典:Wiktionary
From Middle English sped (“good fortune”).
出典:Wikipedia
出典:『Wikipedia』 (2011/07/20 21:39 UTC 版)
In kinematics, the speed of an object is the magnitude of its velocity (the rate of change of its position); it is thus a scalar quantity. The average speed of an object in an interval of time is the distance traveled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero .