You place a mass m=25 g on a book and slowly increase the angle θ that the book makes with the horizontal. At a critical angle θc​=43∘, the mass starts to slide so you hold the angle constant. The mass takes 0.75 s to slide a distance of 17 cm to the edge of the book. Assume that the values of μs​ and μk​ are uniform all over the book. What is the value of μk​?

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