6. [2 points] For the flow shown, indicate the direction of shear stress on the surface AA of the fluid element. Indicate also whether the stress is positive or negative. Assume I direction to be horizontal with positive to the right and y direction to be vertical with positive direction up. Clearly show how you got to your answers. PITTTTTTTT Answer Shear stress direction (up/down) = Shear stress is (+/-) =

Fig: 1