There's mercury at 20°C between two large horizontal plates. The plates are 10 cm away from each other. The top plate is moving with 1 m/s velocity whilst the bottom plate is being pulled at a velocit

There's mercury at 20°C between two large horizontal plates. The plates are 10 cm away from each other. The top plate is moving with 1 m/s velocity whilst the bottom plate is being pulled at a velocity of 0.3 m/s towards the same direction with the top plate. 

a) Calculate the shear stress at 2,5 cm away from the plate that is moving slower. 

b) Calculate the momentum flux on the faster moving plate.