设有甲、乙两人,甲以2 m/s的速度向东行走,乙以1.5 m/s的速度向西行

设有甲、乙两人,甲以2 m/s的速度向东行走,乙以1.5 m/s的速度向西行走,求甲相对乙的速度大小为_________.

答案

解析:本题主要是考查了速度的相对性,确定一个物体速度的前提是参考系的选取,首先要分析知道甲是以乙为参考系的,然后转化为数学问题求解.

设甲相对乙的速度为v,则v=2 m/s+(-1.5) m/s=0.5 m/s.

答案:0.5 m/s

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