题目
题目
单项选择题

A boy walking to school walks 3 km north and then 4 km west. His displacement is

选项
A.a. 5 km N53°W
B.b. 1 km.
C.c. 7 km.
D.d. 5 km.
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标准答案
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思路分析
When analyzing the boy's displacement, we treat his path as two perpendicular legs: 3 km north and then 4 km west. This forms a right triangle with legs 3 and 4, so the resultant displacement is the hypotenuse of length sqrt(3^2 + 4^2) = sqrt(9 + 16) = sqrt(25) = 5 km. Option a. 5 km N53°W: This matc......Login to view full explanation

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