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How do I find the net work done by friction given 2 different coefficients of friction and one Length?

leo226

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How do I find the net work done by friction given 2 different coefficients of friction and one Length?

A board of length L slides across two different surfaces with 2 different given coefficients of friction. How do I find total work done by friction? I have to use: M(mass), L(length of board), g(gravity), u1 & u2 coefficients.

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smooch92

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