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2015-06-13T00:39:06+08:00

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I think the pen will be at rest if there are no forces acting on it. A thing is in motion if it is moving. If you just hang a pen, it won't move. But if you pluck the string or move the pen, of course it will be in motion.
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2015-06-13T09:28:30+08:00

the pen is at rest because there is no movement because we can only recognize the thing in motion if it is moving
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