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人民教育出版社出版的初二物理课本第２２页第６题，是一道计算（或测量）火车速度大小的题目．题目如果火车钢轨每根长１２．５米，在４５秒内听到车轮和钢轨接头处的撞击声７５次，火车的速度是多少千米／时？（这是坐火车时测车速的简便方法）在分析解答本题时，不少读...
The 6th problem of the second physics textbook published by the People’s Education Press is a topic for calculating (or measuring) the speed of trains. Topics If the train rails are each 12.5 meters long, hear the sound of crashes at the wheels and rail joints in 75 seconds, the train speed is the number of kilometers / hour? (This is an easy way to measure the speed of a train.) When analyzing and answering this question, many readings...