Air (v=1.5×10⁻⁵(m²)/(s)) is at rest between two fixed parallel plates 2 cm apart. At time t=0, the lower plate suddenly begins to move at 30 cm/s. Compute the air speed at the center
a) 15 m/s
b) 30 m/s
c) 45 m/s
d) 60 m/s