Second... Newton's Second Law: ma this is the only force in the x direction.

根据牛顿第二定理：,等于。，ma，equals。。。,这是x方向的,唯一一个力。

youdao

of the force in the x direction.

若只在y方向移动。

youdao

So, the direction of the force is going to be that of x, y, z.

所以方向是。

youdao

So, the direction of the force is going to be that of x, y, z.

所以方向是。

youdao