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2004年高考试题(江苏卷)的第18题原题如下:一个质量为M的雪橇静止在水平雪地上,一条质量为m的爱斯基摩狗站在该雪橇上.狗向雪橇的正后方跳下,随后又追赶并向前跳上雪橇;其后狗又反复地跳下、追赶并跳上雪橇,狗与雪橇始终沿一条直线运动.若狗跳离雪橇时雪橇的速度为V,则此时狗相
The 18th title of the 2004 High Test Question (Jiangsu Reel) was as follows: A sleigh of mass M was standing on a level snow, and a Malamute with a mass of m stood on the sledge. The dog jumped to the back of the sled. Then they chased and leapt forward on the sledge; then the dog jumped again and again, chased and jumped on the sledge, and the dog and the sledge always moved in a straight line. If the dog sled off the sledge when the speed of the sled was V, then the dog phase