Question 4 (Similar to P1.75, text) Two flat plates are oriented parallel above a fixed lower plate as shown in the figure. The top plate is located 20mm above the fixed plate (i.e. b=20mm ), is pulled along with a speed V=1cm/s. The other thin plate is located a distance 5mm (i.e. c=0.25 ) above the fixed plate. If the viscosity of the fluid between the lower plates is =20mPa.s, and the fluid between the upper plates has a viscosity of =40mPa.s, determine the velocity of the lower plate, V1. As shown, both velocity profiles are linear