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题目:在一光滑水平的长直轨道上,等距离地放着足够多的完全相同的质量为m的长方形木块,依次编号为木块1、木块2、木块3、……等,如图1所示.在木块1之前放一质量为M=4m的大木块,大木块与木块1间的距离与相邻各木块间的距离相同,均为l.现在所有木块都静止的情况下,以一沿轨道方向
Title: On a smooth horizontal long straight track, a sufficient number of identical rectangular wooden blocks of mass m are placed equidistantly, numbered sequentially as wooden block 1, wooden block 2, wooden block 3, ... and so on. As shown in Figure 1. Before the block 1 is placed a mass of M=4m. The distance between the large block and the block 1 is the same as the distance between the neighboring blocks. Both are now l. When all are still, take a track