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关于运动等问题的对话──据关心本刊的读者来信提出的问题而作夏之问：运动物体的位移和所用时间的比值叫速度．通常把速度的大小叫速率，速率是标量．对于这句话有两种理解：一种认为速率是运动物体经过的路程和所用时间的比值；另一种认为速率是运动物体的位移的大小和...
Dialogue on issues such as sports ─ ─ According to the concern raised by readers of this issue, I asked Xia Xiazhi: The ratio of the displacement of moving objects to the time spent is called speed. Rate is usually the size of the speed, the rate is a scalar. For this sentence there are two kinds of understanding: one is that the rate is the ratio of the distance traveled by the moving object and the time spent; the other that the rate is the size of the displacement of moving objects and ...