You can ask me where it will be nine seconds from now, eight seconds from now, how fast will it be moving.

你们可以问我九秒后它的位置,或者八秒后,以及它的运动速度

耶鲁公开课 - 基础物理课程节选

Light travels basically a foot in a nanosecond. Simple rule of thumb.

光行进的速度是每纳秒一英尺,很简单的经验法则了。

麻省理工公开课 - 计算机科学及编程导论课程节选

It's something I throw up has an initial speed of 10 meters per second.

抛出物体的,初速度是10米/秒

耶鲁公开课 - 基础物理课程节选

What it means is if you'd release a rock at that location one second before with a certain speed that we can calculate, it would've ended up here with precisely the position and velocity it had at the beginning of our experiment.

它的意义在于,若在该处以特定速度抛出一个物体,这个速度可通过计算得到,一秒之后,物体会运动至我们设定的起点,并且速度为我们设定的初速度

耶鲁公开课 - 基础物理课程节选