1.74 Three large plates are separated by thin layers of ethylene glycol and water, as shown in Fig. P1.74. The top plate moves to the right at 2 m/s. At what speed and in what direction must the bottom plate be moved to hold the center plate stationary? 0.1 cm Copper plate 0.2 cm Water (20°C) 2m/s Plastic plate Steel plate Ethylene glycol (20°C) Figure P1.74