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？
2
Because of the resistive forces, because of the drag by the liquid, the object is going to get a velocity in this direction, so there's going to be a component of the resistive force opposing it.
因为阻力，因为液体中的阻力，物体的速度，是朝这个方向，所以会有，一个相反的阻力。
3
And the one-dimensional problem indicates that the velocity that I'm dealing with is the component in this direction.