Blocks 1 and 2 of masses ml and m2, respectively, are connected by a light string, as shown above. 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 l and 2 move with a constant velocity v down the inclined plane, which makes an angle q with the horizontal. The kinetic frictional force on block 1 is f and that on block 2 is 2f. I know that the coefficient of friction would be Ff/m1(-9.8)cos(angle). How would I find the value of the suspended mass M that allows block 1 & 2 to move with constant velocity?