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俗话说：刀越磨越亮，脑筋越用越灵，理越辨越清．同学们学过这两种运动后，应当有所思．思源于疑．疑，是引起思考的动因，是激发求知欲望、激励探索精神的最积极最活泼的因素．现举如下两例疑难问题．跟大家一同辨析．问题１“物体沿直线运动，每分钟通过的路程都是１００米?
As the saying goes: The more polished and brighter the knife is, the more you use your brain, the better you get. After classmates learned these two kinds of exercise, they should think it over. Thoughts originated from doubt. Suspicion is the cause of thinking. It is the most active and most active factor in inspiring the desire for knowledge and inspiring the spirit of exploration. Here are two examples of difficult problems. To identify with everyone. Question 1 "The object moves in a straight line. The distance traveled every minute is 100 meters.