In other words, you don't have to be moving actually in a circle to have the acceleration.
也就是说,你不必真的在一个圆上运动以获得相应的加速度
What's your plan for measuring acceleration if some little thing is moving?
如果某个小物体在运动,你要如何测量加速度
That also cannot happen, so they're moving with the same acceleration.
这也不可能发生,所以它们以相同的加速度运动
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