At a post office, a parcel that is a $40\mathrm{.}0$ kg box slides down a ramp inclined at $27\mathrm{.}0\backslash$deg with the horizontal. The coefficient of kinetic friction between the box and plane is $0\mathrm{.}0210.($Enter the magnitudes.$)$

$($a$)$

Find the acceleration of the box $($in m$/$s$^2).$

$($b$)$

Find the velocity of the box $($in m$/$s$)$ as it reaches the end of the plane, if the length of the plane is $2$ m and the box starts at rest at the other end of the plane.