位移大小正负怎么比较,是绝对值么速度大小呢`````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
位移大小正负怎么比较,是绝对值么速度大小呢`````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
位移大小正负怎么比较,是绝对值么
速度大小呢`````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
位移大小正负怎么比较,是绝对值么速度大小呢`````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
用绝对值