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程守栋等编《普遍物理学》第一册中习题1—20的答案值得推敲。该题题意是这样的:“以初速20米/秒竖直上抛一物体后,又以10米/秒的初速竖直上抛另一物体,在高度4米的地方相遇,试求两物体先后上抛的时间差。”书后此题答案只有一个,即时间差为3.3秒。另外由上海高等工业院校物理编写组和由长春市大专院校普通物理题解编写组高联先后分别编写的关于该书的两种习题解答上,对于此题,都只给出了如上所述的一种答案。然而笔者
Cheng Shoudong et al., “General Physics,” Volume I Exercise 1-20 worth considering. The title of the question is this: “With an initial velocity of 20 m / s, after throwing an object vertically, another 10 m / s in the vertical velocity throws another object at a height of 4 meters, The objects on the throwing time difference. ”After the book this question answer only one, that time difference of 3.3 seconds. Also by the Shanghai Higher Industrial University physics writing group and by Changchun City College of ordinary physics problem-solving compilation group has been prepared by the High School of the two exercises on the answer to this question, only given the above One answer. However, I