1 速度向量空间中两点的物理联系是什么?
以这两点为端点的向量是这两个速度之差
2 找到一个单位向量其方向指向A=...和B=...中间
先找到A方向的单位向量a=（1/根号34）*（5X-3Y）,根号34是A的长度.同理得到B方向单位向量b,a+b就是A和B方向的中间,再除以根号2即a+b的长度,就可以得到所求向量了
英语翻译What is the physical relation between any two points ins
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