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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.
9 S2 A1 ?7 D' s5 A; `" H# C/ k- F9 ]When no net force act on a object, the object will travel with constant velocity.
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! j1 o) v' D5 E0 L# Y6 _Since the water on the earth will be attracted by gravitational force, it will fell on the ground.( l# j3 n8 R' D+ U0 x, r
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But 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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