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题目:有甲、乙两运动员在400米田径场练习长跑,他们同时、同地同向出发,甲跑一圈用时64秒,乙跑一圈用时70秒,照此计算,从出发开始到他俩再次相遇要多长时间?分析:根据题意可分别求出ν_甲和ν_乙,显然有ν_甲>ν_乙,当他俩再一次相遇时,甲比乙多跑了一圈,即甲比乙多跑了400米,根据运动学规律,可得以下几种解法:
Title: There are two athletes A and B who practice long distance running at the 400 meters track and field field. They start at the same time and in the same direction. They run for 64 seconds in one circle and 70 seconds in one circle. According to this calculation, they start from departure to him. How long does it take for the two to meet again? Analysis: According to the meaning of the question, ν_A and ν_B can be found separately. Obviously there is ν_A>ν_B. When they meet again, A runs more than B. Circle, that is, A more than 400 meters to run more than 400, according to the laws of kinematics, can get the following solutions: