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Conversely, if I knew the velocity of this object, I also know what time it is, provided I knew the initial velocity.
反过来,如果我知道了这个物体的速度,我也同样可以知道时间,只要初速度是已知的
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It's very interesting because velocity seems to require two different times to define it -- the initial time and the final time.
这非常有趣,因为速度似乎需要两个时间才能算出来,初时刻和末时刻
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What that means is, if you know the velocity of the given time and you know the initial velocity, you know what time it is.
这个方程的意义是,如果你知道某个给定时刻的速度,并且知道初速度,你就能知道运动的时间
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What is it you have to know about this object that was thrown, I claim, is the initial location of the object and the initial velocity.
关于这个物体,我们需要了解什么,我要强调的,就是这个物体的初位置和初速度
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That's because they could have been released from different heights with different initial velocities.
那是因为它们可能是从不同的高度,以不同的初速度被抛出的
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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
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So, when I threw that thing up and you caught it, what you are doing mentally was immediately figuring out where it started and at what speed.
所以当你接住我抛出的物体时,你大脑里的反应就是,立刻弄清它的初位置以及初速度
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I want you to find the speed so it will land here.
我希望你们求出初速度,使它落在这儿
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A clock tells you what time it is, but you can also say what time it is by seeing how fast the particle is moving because you know it started with some speed.
时钟能告诉你现在的时间,但你也可以通过测量质点速度,来判断当前的时间,因为你知道它的初速度
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Initial velocity is a pair of numbers.
初速度也是一对数字
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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
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For example, if you started here and you did all this and you came back here, the average velocity would be zero, because you start and end at the same value of x, you get something; 0 divided by time will still be 0.
例如,如果你从这里开始运动,经过这个过程又回到这里,平均速度就是0,因为初态和末态的位移相同,你得到了什么呢,0除以时间还是0
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The Law of Inertia says that, "If a body has no forces acting on it, then it will remain at rest if it was at rest to begin with, or if it had a velocity to begin with, it will maintain that velocity."
惯性定律就是,"如果一个物体不受外力作用,那么静止的物体依然保持静止,如果物体有个初速度,那么就保持此速度不变"
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Even at=0, and it has an initial velocity, so even without any acceleration, it will be moving from y0 to y0+vt.
即使at=0,它仍然有初速度,因此即使加速度为0,它也会从y0运动到y0+vt
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I tell you the initial velocity v0, I tell you at what angle I fire it.
我会告诉你们初速度 v0,以及我以多大角度射出
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Second formula tries to relate the final velocity of some time, t, to the initial velocity and the distance traveled with no reference to time.
第二个式子能把某段时间t的末速度,和初速度,经过的路程联系在一起,并且不引入时间
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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
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The velocity has no vertical component. There is no Vy.
初速度没有竖直分量,没有 Vy
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Then, in every situation where the body has an acceleration a, the location has to have this form, where this number is where it was initially, this was the initial velocity of the object.
在任何研究对象具有加速度a的情况下,它的位移就一定具有这种形式,这个系数代表了它的初位移,这个代表了它的初速度
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