Problem $7$:

An object of mass $\backslash ($ m $\backslash )$ is released from a height $\backslash ($ h $\backslash )$ on an inclined plane. 'The coetticient of friction between the object and the inclined plane is $\backslash (\backslash$mu $\backslash ).$ The object moves a distance $\backslash ($ d $\backslash )$ on the inclined plane and continues to move on the horizontal surface. Find the work done by the friction force $\backslash ($ f $\backslash ),$ and the work done by the gravitational force $\backslash ($ F$\_\{$g$\}=$m g $\backslash ),$ when the object reaches the horizontal surface.