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作者 evanzxcv 在 PTT [ Tennis ] 看板的留言(推文), 共13則

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[數據] S.Williams vs. M.Sharapova

[ Tennis ]55 留言, 推噓總分: +30

作者: coolboychiu - 發表於 2012/08/04 22:34(11年前)

46^F推evanzxcv:球速差異其實跟用手或球拍的關係不大08/05 06:15

47^F→evanzxcv:而是碰撞的動量守恆,人類揮臂極速大概是時速100多公里08/05 06:15

48^F→evanzxcv:投擲或擊出球的動作可看成彈性碰撞08/05 06:16

49^F→evanzxcv:當m2遠小於m1時,被m1以v1的速率碰撞後會以2*v1速率彈開08/05 06:17

50^F→evanzxcv:而m2越接近m1,被m1碰撞後的速率也就越低(越接近v1)08/05 06:17

51^F→evanzxcv:球類的質量是棒球>網球>羽球,所以可想而知極速的差異了08/05 06:17

[Live] Novak Djokovic def. Yen-Hsun Lu.

[ Tennis ]1497 留言, 推噓總分: +835

作者: soulmate - 發表於 2010/06/30 19:57(14年前)

280^F推evanzxcv:正戴嚴重影響視線06/30 20:12

2010 Wimbledon 男單32強 (上半區征戰中)

[ Tennis ]228 留言, 推噓總分: +160

作者: catandfish - 發表於 2010/06/26 00:42(14年前)

146^F推evanzxcv:納豆晉級06/29 03:18

[情報] Nicolas Mahut vs.John Isner

[ Tennis ]796 留言, 推噓總分: +514

作者: TheJim - 發表於 2010/06/24 21:26(14年前)

379^F推evanzxcv:==66:66==06/24 23:28

416^F推evanzxcv:67:6706/24 23:33

567^F推evanzxcv:賽末點!06/24 23:47

582^F→evanzxcv:Isner贏了!06/24 23:48

[活動] 猜Isner vs. Mahut 最後第五盤結束比數

[ Tennis ]423 留言, 推噓總分: +396

作者: Athletics - 發表於 2010/06/24 06:29(14年前)

395^F推evanzxcv:Isner 95:9306/24 20:57

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