The equation of the velocity distribution over a plate is given byu = 2y – y² where u is the velocity in m/s at a point y meter from theplate measured perpendicularly. Assuming μ = 8.60 poise, the shearstress at a point 15 cm from the boundary is:
a)1.72 N/m²
b)1.46 N/m²
c)14.62 N/m²
d)17.20 N/m²