因为向量投影的公式是:向量a的模 乘以 cos
所以答案应该是0
当力与坐标轴垂直时,力在该轴上的投影不变,还是等于零啊?
当力与坐标轴垂直时,力在该轴上的投影不变,还是等于零啊?
数学人气:535 ℃时间:2020-04-02 10:01:43
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