Toothpaste, known to be a Bingham fluid, follows the below relation between shear stress and shear rate:

$=a{}^{}+5$

Such that $"$a$"$ is a constant. It is known that the slope of this linear relation represents the dynamic viscosity.

When toothpaste was subject to shearing stress of $5$ psi, the velocity of the upper plate was $5f\frac{t}{s}$ with a fluid thickness of $5mm.$

If the specific gravity of the toothpaste is $1\mathrm{.}5,$ what is its kinematic viscosity.