两道高中物理题（相对速度和向量）！
1,twotrainsAandBaretravelingonlineswhichcrossatrightangles.Atravelsat40km/h,andBat50k...
1,two trains A and B are traveling on lines which cross at right angles. A travels at 40 km/h, and B at 50 km/h. find the velocity of B relative to A.
2, A superman warks east at 42 km/h. He suddenly walks south at 26 km/h. What is his change in velocity ? graw a vector diagram .
1，第一题，为什么这就是他们的相对速度？这道题如果是find the velocity of A relative to B 结果一样吗？
2，第二题望解释 展开
2, A superman warks east at 42 km/h. He suddenly walks south at 26 km/h. What is his change in velocity ? graw a vector diagram .
1，第一题，为什么这就是他们的相对速度？这道题如果是find the velocity of A relative to B 结果一样吗？
2，第二题望解释 展开
2个回答
推荐律师服务：
若未解决您的问题，请您详细描述您的问题，通过百度律临进行免费专业咨询
