送交者: cornbug 于 2014-11-12, 22:33:50:

回答: 如何降速，反方向扔些垃圾？ 由 pgss 于 2014-11-12, 20:28:00:

• high school physics: more elastic if masses of 2 bodies are closer - pgss (95 bytes) 2014-11-13, 10:13:03 (763525)

加跟贴