(adsbygoogle = window.adsbygoogle || []).push({}); A box of books is initially at rest a distance D = 0.545 m from the end of a wooden board. The coefficient of static friction between the box and the board is μs = 0.302, and the coefficient of kinetic friction is μk = 0.238. 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.

a=(m2g-μm1)/(m1+m2)

3. The attempt at a solution

My homework lets me try another version of the problem (it's online). For that, I did the average of the two frictions plus the distance. It gave the correct anwser, however; that doesn't seem to work for this version of the problem. The above equation is the closest thing that I could find in my book, but, it requires mass which I don't have. Would mass be cancelled out I'm guessing? Any help would be appreciated :D

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# Acceleration on an incline with friction

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