length在这里是指斜面的长度.
全句翻译：一个高5米,斜面长度20米的光滑斜面,把一个2公斤的物体放在斜面上,下面哪一个选项最接近它受到的净力?
顺便做个答案,答案显然是5牛顿.两个方向的比例为5米/20米=0.25,2公斤也就是20牛顿,0.25*20牛顿=5牛顿.
英语翻译A frictionless inclined plane of length 20m has a maximu
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