质量为m的小球从沙�上方自由下落经过时间t1到达沙�表面又经过时间t2停在沙�里求 1沙对小球的平均阻力f2小球在沙�里 Template




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tomski质量为m的小球从沙�上方自由下落经过时间t1到达沙�表面又经过时间t2停在沙�里求 1沙对小球的平均阻力f2小球在沙�里 coloring