And that linearvelocity, which, in this case, is really your speed, is of course the circumference of the circle divided by how many seconds it takes to go around.
线速度，在这个例子里，就是速率，是这个圆环的周长，除以走一圈，需要的秒数。
2
Next, create your dynamic body, which has a position, initial linearvelocity, and angle.
接下来，创建动态物体，它具有方位、初始线速度和角度。
3
So this is a linearvelocity, this is an angular velocity.