An object slides on a level surface in the $+x$ direction. Eventually it slows down and comes to a stop with a constant acceleration of $-2\mathrm{.}45\frac{m}{s^2}.$ The only force acting on this object $($in its direction of motion$)$ is friction. The coefficient of kinetic friction between the object and the surface is most nearly:

cet $=ma$

a$.0\mathrm{.}12$

b$.0\mathrm{.}49$

$=lnx(-2\mathrm{.}45)$

c$.0\mathrm{.}25$

d$.$ Impossible to determine without knowing its mass