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6#
發表於 2005-4-5 12:33 AM
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i believe that can be easily explained by newton first law.) f( w# z+ f) w2 m8 q
When no net force act on a object, the object will travel with constant velocity.
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/ L& H+ W* q: d, }+ c7 J* _Since the water on the earth will be attracted by gravitational force, it will fell on the ground.* y' K2 A1 M4 [' z- h# N! K
8 Z V9 C; h. B8 b6 N! s0 T( n/ qBut in the space, no force is added on the water will u X the ball ,so the water will remain its old velocity(don't move) |
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