MPa$($b$)$ The point of maximum deflection Delta y occurs at the center of the specimen and is described by the expression

$y=\frac{F{L}^3}{48EI}$

where $E$ is the modulus of elasticity and I the cross$-$sectional moment of inertia. Calculate $y$ of $269$ N $.$ Assume that the elastic modulus for the glass is $66$ GPa $.$

$y=$ m