We define average velocity as the position at time four seconds minus the position at time zero, 4 divided by four.

我们定义平均速度，是四秒时的位置，减去0秒时的位置，除以。

youdao

Now, I would think that it is reasonable to ask the following question: What is the average velocity, for instance, between time zero and time four?

现在，我认为,提出如下问题,是十分合理的：,比如说，平均速度是多少，在0到4秒之间？

youdao

The average acceleration 2 between time t1 and time t2 2 would then be the velocity at time t2 minus the velocity at time t1, divided by t2 minus t1.

在t1和t2之间的，这段平均加速度2，等于t2时刻的速度2，减去t 1时速度，再除以。

youdao