If the velocity is the same in both cases can't you see that this horizontal component is way larger than this horizontal component?
如果发射的速度无异，明显这个的水平分量，要远远大于这个？
The bus goes over a bump. Its velocity is initial horizontal but it acquires a small upwards component as it rises, then a downwards component, then back to being purely horizontal.
当汽车驶过一个小包时，上坡时原本是水平的速度获得了一个小小的向上的分量，下坡时又有了一个向下的分量，然后回归水平。
This concept includes: friction which primarily determines the reduction in the horizontal component of post-impact ball velocity;
擦力主要确认地面与网球表面接触时，地面对网球水平方向运行速度的影响性能；
This concept includes: friction which primarily determines the reduction in the horizontal component of post-impact ball velocity;
擦力主要确认地面与网球表面接触时，地面对网球水平方向运行速度的影响性能；
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