我也可以在释放时,给一个初速度。
But I can also, when I let it go, give it a certain velocity.
重力在这里,这是初速度。
在这个实验中,两个光门测量小球的初速度。
For this activity, two photogates measure the initial speed of the ball.
以初速度为0释放。
给它一个初速度。
也许是这里零速度,释放,也许给它一个初速度。
Maybe it's just that I release it here; with zero speed; maybe I give it a little speed.
也许是这里零速度,释放,也许给它一个初速度。
Maybe it's just that I release it here; with zero speed; maybe I give it a little speed.
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