速度是描述物体运动快慢搭方向个物理量,是位移辰光变化率,正式定义是位移对时间个导数,用方程式表达个说话是[1]

箇当中,是速度。

参考

编辑
  1. Wilson, Edwin Bidwell (1901). Vector analysis: a text-book for the use of students of mathematics and physics, founded upon the lectures of J. Willard Gibbs. p. 125.