OK, so that's the velocity vector.
好,这就是速度矢量。
And so, that's called the velocity vector.
因此我们叫它速度矢量。
OK, that's what we call the velocity vector.
就是我们所说的速度矢量。
Just take the derivatives and that's the velocity vector.
直接计算对时间的导数就是速度矢量
you get the velocity vector.
就可以得到速度矢量
take the derivative of this, get the velocity vector and you notice his magnitude is a constant Whichever way you do it, you can then rewrite this as v square over r.
对这个式子求一次导,就能得到速度矢量,你会发现其模长是常数,不管用什么方法,加速度也可以写成 v^2 / r
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