若前一半为一的平均速度为v一,后一段位移的平均速度为v二,全程的平均速度又是多� ? 知乎 Template




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tomski若前一半为一的平均速度为v一,后一段位移的平均速度为v二,全程的平均速度又是多� ? 知乎 coloring