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【多选题】
(长沙一中2015~2016学年高一上学期检测)物体做直线运动时可以用坐标轴上的坐标表示物体的位置,用坐标的变化量Δx表示物体的位移。如图所示,一个物体从A运动到C,它的位移Δx 1 =-4m-5m=-9m;从C运动到B,它的位移为Δx 2 =1m-(-4m)=5m。下列说法中正确的是 ( )A.
从C到B的位移大于从A到C的位移,因为正数大于负数
B.
从A到C的位移大于从C到B的位移,因为符号表示位移的方向,不表示大小
C.
因为位移是矢量,所以这两个矢量的大小无法比较
D.
物体由A到B的位移Δx=Δx 1 +Δx 2
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