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hopingzou: ½ð±Ò+30, ·­ÒëEPI+1 2014-07-30 16:15:56
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"Figure 1 gives the changes in the velocity of the object in the process of movement, upward is positive. The first example shows object contact with the upward of the wall at the tail in the initial stage of movement of object, then come back space, at the last object contact with the low of the wall. The second and the third examples both show objects contact with the upward of the wall at the tail in the process of movement. For a better comparison, we supplement the rules of movement of objects of the second example."

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