Agree! 200km/hr is about 56 m/s. A gun bullet travel ~400 m/s wi

來源: 周老大於 2012-06-10 00:07:23 [檔案] [博客] [舊帖] [給我悄悄話] 閱讀數 : (164 bytes)

回答: 3.5kg metal wheel hub, impact speed 200km/hr, 由 Shark 於 2012-06-09 20:57:15

of ~ 10g. 3.5 kg steel with sharp edge at 200 km/hr is like a bullet 300 time bigger.

Think the other way, how fast you think you can swing a hammer?

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• Typo: 30 times bigger. -周老大- ♂ (0 bytes) () 06/10/2012 postreply 00:25:53