Bill runs 400 meters to Andy's house, turns around, and runs 400 meters back home.  What is Bill's distance?

小陳跑了 400 公尺到大陳家，轉身又跑了 400 公尺回家。小陳跑過的距離是多少？

Bill runs 400 meters to Andy's house, turns around, and runs 400 meters back home.  What is Bill's displacement?

小陳跑了 400 公尺到大陳家，轉身又跑了 400 公尺回家。小陳跑過的位移是多少？

A car drives 84 meters forward.  It's displacement and distance would be the same.

一輛車向前行駛84公尺。它的位移和距離將是相同的。

A person walks 50 meters directly north, stops, and then travels 32 meters directly south.  What is their displacement?

一個人向北步行50米，停下來，然後向南步行32米。他們的位移是多少？