The equation for position $x($meters$)$ for a particle moving horizontally with a constant acceleration of $a=19\mathrm{.}315\frac{m}{s^2}$ when the particle was initially at rest with

$v_O=0\frac{m}{s}$ and $x_O=0$ meters is in the form of a second order polynomial. The value of the constant immediately preceding the $t^2$ in that second order polynomial equation for position $x($meters$)$ is most closely to: