物理学上有两个说法,平均速率和平均速度
速率是指单位时间内通过的路程,速度指单位时间内通过的位移大小（即位置变化量）
加个平均就是指总路程中或总位移两个物理量的平均值某一物体在一段时间内通过一段位移，该物体单位时间内通过的位移就是平均速度。即总位移/单位时间
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