$1.$ An airplane propeller slows down from an mimal angular speed of $12\mathrm{.}5$ resolutions$/$sec to a speed of $5\mathrm{.}00$ revolutions$/$sec$.$ During this process, the propeller rutates thetnagh $25$ revolutions. if the angular acceleration is a constant,

$($a$)19\mathrm{.}6$md $/$ m $*$ e $*$ c $^2)$

$($b$)6\mathrm{.}25$md $/$ n $*$ e $*$ c $^2*$ z

$($c$)28$md $/($sec$^2$ z$)$

$($d$)12\mathrm{.}5$md $/$sec$^2.$