来自《耶鲁大学开放课程：基础物理 第1集 第1集》

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  you will find as at+b. That's the velocity of the object.
  你会得到at+b 这就是物体的速度
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  Then, you can then understand
  然后你现在就可以知道
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  that v(0) is what b is, which we write as v0.
  v(0)就是系数b 我们记作v0
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  Okay, so the final answer is that
  最终的结果是
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  So what I'm saying here is
  我在这里想说的是
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  we are specializing to a limited class of motion
  我们正在专门讨论一类问题
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  where the particle has a definite acceleration, a.
  这些问题中 质点都有一个确定的加速度a
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  Then, in every situation where the body has an acceleration a,
  在任何研究对象具有加速度a的情况下
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  the location has to have this form,
  它的位移就一定具有这种形式
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  where this number is where it was initially,
  这个系数代表了它的初位移
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  this was the initial velocity of the object.
  这个代表了它的初速度
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  So, when I threw that thing up and you caught it,
  所以当你接住我抛出的物体时