Answers

2016-07-06T18:18:56+08:00
The coin will come with cardboard !
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2016-07-06T18:24:39+08:00
When we slowly pulled the cardboard,the coin on top moved with the cardboard.                                                                                                        because the frictional force acting between the coin and the cardboard caused the coin to stay on top of the cardboard and move with it.
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