Answers

2014-06-22T21:51:22+08:00
Because of you're force(push)

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2014-06-25T19:55:31+08:00
Yes, because the force that acts on the book is unbalanced... if you pushed the opposite side of the book, the book will not move because the force that acts on it is balanced... The object will move if the force that act on it is unbalanced,
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