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A box of books is initially at rest a distance D = 0.515 m from the end of a wooden board. The coefficient of static friction between the box and the board is ?s = 0.336, and the coefficient of kinetic friction is ?k = 0.204. The angle of the board is increased slowly, until the box just begins to slide; then the board is held at this angle. Find the speed of the box as it reaches the end of the board.

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