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Date Posted: 20:07:52 03/22/00 Wed
Author: 年糕
Author Host/IP: pcd028061.netvigator.com / 203.198.105.61
Subject: 牛頓第三定律我好唔未呀?

我經常都唔能夠分別到兩道是否作用力同反作用力?
而且的會考題都唔明呀....
如ce 96-10:
題中的f1和f2是一對的,但是f3都唔知點解會有....
而且題目中指有向上的加速率,咁淨力唔係向上咩?
點解題中的f1和f2加起後等於零,仲會有一個力係向下?

我最唔明的是我選E,但係個答案係A呀!

仇SIR幫幫忙呀.....THX

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