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2008年上海市初中物理竞赛(大同中学杯)初赛第41题:如图1所示,某一实验室内有一宽度为d的跑道,假设有一连串玩具车沿着同一直线以相同的速度v鱼贯驶过,玩具车的宽度
In the 2008 Shanghai Junior High School Physics Competition (Datong Middle School Cup) Preliminary Question 41: As shown in Figure 1, there is a runway with a width of d in a laboratory. Suppose there is a series of toy cars along the same line at the same speed v. Passing, the width of the toy car