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方寸斗室小天地正气迷漫大世界 ![]()
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【答案】应助回帖
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“图1给出了物体在运动过程中速度的变化,向上为正。第一个例子说明物体在运动的初始阶段,尾部与上壁面接触,然后回到空中,最后与下壁面接触。例子2和3均表示物体在运动过程中尾部始终与上壁面接触。为了更好地比较,我们也补充了第二个例子的物体运动的变化规律。”
"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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