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## Homework Statement

At what distance "d", from point "A", the board with the person will slide whereas

http://img267.imageshack.us/img267/6139/skkkkkkk.jpg [Broken]

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## Homework Equations

Weight of board = 50 [kg]

Weight of person = 100[kg]

Frictional coefficient between board and pit: Us = 0.4

c = 3[m] b = 4[m] a =10[m]

((The answer is d = 6.47 [m] ))

## The Attempt at a Solution

I found all the unknowns, but I don't know how to answer the actual question. They're asking for the distance where the plank would slide with the person...can't see how I find that out...

http://img341.imageshack.us/img341/6096/zzzzaf.jpg [Broken]

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