関連ワード:  why is velocity a vector and speed is not    why is velocity a vector but not speed    why is velocity a vector quantity but speed is not    why is velocity a vector quantity while speed is not    why do we say velocity is a vector and speed is not    why is velocity considered a vector but speed is not    why is speed not a vector    why is velocity a vector  
結果 : why is velocity a vector and speed is not