位移大小怎么算?

位移大小怎么算? 位移和位移大小有什么区别?位移大小有负的吗?位移大小怎么算? 位移怎么比较大小 物理中的位移大小、方向怎么计算? 位移怎么求它的大小 物理中的位移大小、方向怎么计算? 某人沿半径为R的水平圆形跑道跑了4/5圈,则其位移的大小是?位移大小怎么算？ 位移怎么算 位移怎么算 路程 位移 位移的大小 一个物体加速度不变,先加速后减速位移怎么算一个物体加速度大小方向恒定不变,先加速后减速 则位移怎么算 怎样比较位移大小 位移能不能比较大小 什么事位移的大小? 以初速度v0的水平抛出一个物体,当它竖直分位移与水平位移相等时,则:位移大小怎么不是水平位移呢 位移大小正负怎么比较,是绝对值么速度大小呢````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````` 位移有正负,位移大小无正负, 结构位移比怎么才算不够?我说的是位移比,不是位移角