现在看y轴方向。
这是y方向。
It comes to a halt in the y direction.
什么时刻它会在y方向停止前进。
There is almost no acceleration in the y direction.
在y方向几乎,没有加速度。
What is the acceleration in the y direction at time zero?
那y方向上,0时刻的加速度是多少？
If you move in the y direction, it decreases at a constant rate.
如果你在y轴的方向上移动，函数值将匀速地减少。
Let's first decompose this force as we did before, in the y direction.
还是照惯例,把力分解到y方向。
in the minus y direction and there is a normal force in the plus y direction and these two exactly cancel each other.
,在y的负方向,那么也有一个常力,在y的正方向,这两个力互相抵消。
So, the direction of the force is going to be that of x, y, z.
所以方向是。
For velocity in the x, y, or z direction.
对于x，y，或z三个方向的速度。
And this is the direction, positive direction, of y.
这个方向，是y的正方向。
And I will call this direction y, as I always do perpendicular to the surface.
照惯例把垂直方向，设为y方向。
This is the vertical direction y.
这个是垂直的，Y轨道。
This is the vertical direction y.
这个是垂直的，Y轨道。
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