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upwards on the ball as it land . 5) A 4-kg book is pressed horizontally against a rough wall (u#0) by a force. If the

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upwards on the ball as it land . 5) A 4-kg book is pressed horizontally against a rough wall (u#0) by a force. If the book accelerates downward at 2 m/s and the coefficient of friction between the wall and the book is 0.4, what is the size of the force? rew and Bill each

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