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1/2mv^2=(F - fg)s cos teta
mv^2=2(mg - myu mg)s cos teta
mg - myu mg= mv^2/2S cos teta
mg( 1 -myu)=mv^2/2s cos teta
1-myu= v^2/2gScos teta
myu= 1 -(v^2/2gS cos teta)