So during the second second, the velocity is not changing.

因此在第二秒内，速度没变。

youdao

Let's now go to the second second and let's see what happens there.

现在来看第2秒，看看发生了什么。

youdao

Let's now go to the second second and let's see what happens there.

现在来看第2秒，看看发生了什么。

youdao