Kinetic friction, pulley, inclined plane

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Homework Statement




blocks 1 and 2 of masses m1 and m2 respectively, are connected by a light string. these blocks are further connected to a block of mass M by another light string that passes over a pulley of negligible mass and friction. blocks 1 and 2 move with constant velocity v down the inclined plane, which makes an angle (theta) with the horizontal. the kinetic frictional force on block 1 is f and that on block 2 is 2f.

Determine the coefficient of kinetic friction between the inclined plane and block 1.

Homework Equations



F=ma
F=uN

The Attempt at a Solution



N=mgsin(theta)+mg

i don't know where to go from there
 

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