Escape velocity is simply the speed of an object that's shot out of a cannon the minimum initial speed so that the object could later escape Earth's gravity on its own.

逃逸速度就是一个物体的速度，比如说，从加农炮中射出的最小初始速度，这样这个物体以后就可以自己脱离地球的引力。

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Then gravity is there, and there is that initial speed.

重力在这里，这是初速度。

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For this activity, two photogates measure the initial speed of the ball.

在这个实验中，两个光门测量小球的初速度。

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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

So，the point is,every object falling under gravity is given by the same formula, but there are many, many objects that can have many histories, all falling under gravity, and what's different from one object and the other object is, when was it dropped, from what height, and with what initial speed.

关键是,每一个受重力作用下落的物体,都有同样的表达式,但是各个受重力作用下落的物体,都有不同的初始条件,所以它们的区别在于,下落时刻,下落高度和初始速度

耶鲁公开课 - 基础物理课程节选

Car is traveling with some initial speed v0 in the horizontal direction.

车以 v0 的初速度沿水平方向开出

耶鲁公开课 - 基础物理课程节选

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