求一道物理题过程分析http://edus.cnmedu.com/6/jstk/g3tk/19000101/2002-2003/g3wl/1/g3wl7/c2yw.htm这里面的第21题.答案有个地方不太懂:1.题目说明了滑块相对小车共滑行了6s 但最后又求出来个5s 2.小车后3s的
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