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會出現錯誤. 例如:平均速度是位移與時間的比值,而平均速率是路程與時間的比值.而位移的大小通常不等於路程.位移的大小是初末位置間直線段的長度,而路程是運動路徑的長度.位移的大小與路徑無關,而路程與運動路徑有關.
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