speed就是指速度,是一个比较非正式的口语化单词
velocity是一个专业词汇,一般学过物理的都知道v表示速度,这里的v就是velocity的缩写,v是一个矢量,当然是同时表示方向和速率,可以总结为velocity = speed + direction.另外speed其实也有表示速率的意思,没方向
what is the difference between speed and velocity?
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