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

耶鲁公开课 - 基础物理课程节选

If you solve for that, you find y-y0=v0^/, and if you put in the v_0 I gave you, which was what, 10?

如果你解这个式子,你会得到y-y0=v0^/,如果再把我给你的v0代入,那个数是多少 10

耶鲁公开课 - 基础物理课程节选

If you call that your origin, your y0 will be 0, but ground will be called -15.

如果你取楼顶为原点,你的y0就等于0,但是地面就要标记为-15

耶鲁公开课 - 基础物理课程节选

What is y-y0? The final y is 0, the initial y is 15. You solve for that equation and you will find the final velocity.

-y0是什么,末态的y是0,初态的y是15 你们已经得到,然后你可以找到最终速度

耶鲁公开课 - 基础物理课程节选

So y=y0+5 meters, and that was the height to which it rises.

因此y=米,这就是它会上升的高度

耶鲁公开课 - 基础物理课程节选