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20kg object level of 0.1 in the U face to the right movement, movement in the level of the left by,

Shanghai dream village 1232010-04-09 15:11:53 +0000 #1

drunk Fung Yang2010-04-09 15:22:20 +0000 #2
as long as the object in motion and is horizontal, vertical force remains constant, both suffered friction and dynamic friction, the 20N

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