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平均速度描述的是物体位置的变化快慢或是物体位移的变化快慢而非物体运动的快慢,描述物体运动快慢的物理量应是平均速率.
Average speed describes the speed of the object position changes or the speed of object changes rather than the speed of object movement, physical speed of the object describes the physical speed should be the average rate.