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人民教育出版社初中物理教科书第一册第三章《简单的运动》中有这样一道计算题:“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?”如何解这道题,一时间认论纷纷,说法不一.解一,火车的速度 v=75千米/时这个结果跟人民教育出版社出版的与教本配套的教学参考书给出的答案一致,可是好多老师不同意这种解法,甚至有物理刊物也载文
There is such a calculation problem in the “Simple Exercise” in the third chapter of “The Simple Sports” of the People’s Education Press junior middle school physics textbook: “If the train rails are each 12.5 meters long, you hear the sound of crashes at the wheel and rail joints within 45 seconds. 75 times, the speed of the train is the number of kilometers / hour? "How to solve this problem, a time to speak, have different opinions. Solution one, the speed of the train v = 75 km / hour this result with the People’s Education Publishing The answers given by the Society’s teaching reference book, which is supported by the textbook, are the same, but many teachers do not agree with this solution. There are even physics publications.