Now, what I know is a sum of twosquared minus one.
现在,我得到了两个平方项减去一。
2
All it is sigma 1 s, and then we have two electrons in it, so it's sigma 1 s squared.
所有的都是sigma1s,上面有两个电子,所以是sigma1s的平方。
3
And if you calculate, if you assume that - the acceleration is constant — it's an easy calculation — it turns out that the acceleration is only two meters per second squared.