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

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

youdao

牛顿第二定律，动量定理。

Newton's second law, the Momentum Principle.

youdao

牛顿第二定律，动量定理。

Newton's second law, the Momentum Principle.

youdao