Hi all! I need help! If there are any Physics people out there would you give me a hand?

Block A of weight W slides down an inclined plane S of slope angle 37 degrees at constant velocity while plank B, also of weight W, rests on top of A.  The plank is attached by a cord to the top of the plane.

If the coeffecient of kinetic friction is the same between the surfaces A and B and between S and A determine its value.

can anyone make sense of this?

Thanks in advance,

Jared

Since the speed of A (+B) (total weight 2W) down slope S is constant, the kinetic energy is constant. Normally the kinetic energy would rise, due to the decline of potential energy.
Here, potential energy is declining, kinetic ISN'T rising, because of the 2 friction coef's (since there are 2 friction planes) between A-B and A-S

Through the slope angle you should be able to determine the amount of energy (normally turned into kineticE) that is lost on the 2x friction coeff.

Meaning: why isn't block A accelerating? because the friction of B onto A and A+B onto S keeps it constant.

Long way back, man, I may be wrong here, anyone else make sense of this?