A book moves $2\mathrm{.}15$ m in the $+x-$direction under the influence of a $45\mathrm{.}0-N$ force, also in the $+x-$direction. The work done on the book is $($a$)20\mathrm{.}9$ J ; $($b$)45\mathrm{.}0$ J ; $($c$)48\mathrm{.}4$ J ; $($d$)96\mathrm{.}8$ J $.$