It is interesting for him to study the derivative of a vector.

对他来说，研究矢量的导数是很有趣的事。

youdao

So, the definition will take effect. The acceleration is as a vector, and the acceleration vector is just the derivative of a velocity vector.

有必要对加速度给出一个严格的定义，加速度,作为一个矢量,是速度的一阶导数。

youdao

So, the velocity vector is the derivative of a position vector with respect to time.

速度向量，是位置向量关于时间的导数。

youdao

And, the way we can get it, so, it's called usually V, so, V here stands for velocity more than for vector. And, you just get it by taking the derivative of a position vector with respect to time.

根据它的原理，我们通常用v表示,这里的V更代表速率而不是矢量，你能通过,对一个关于时间的位置向量求导得到它。

youdao

So, it's the second derivative of a position vector.

它是位置向量的二阶导。

youdao

So, it's the second derivative of a position vector.

它是位置向量的二阶导。

youdao