There are nine books in a stack, each with a weight of 10 N. The coefficient of friction between all the books is 0.45 as is the coefficient between the table and the bottom book. What horizontal push must I just exceed on the next to the bottom book to start sliding the top eight books off the bottom one?

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: