Example $8\mathrm{.}5$: A stationary object of mass $\backslash ($ m$=8\backslash$mathrm$\{$~kg$\}\backslash )$ is pulled with an external force of $\backslash ($ F$=50\backslash$mathrm$\{$~N$\}\backslash )$ as shown in the figure. The force is removed at point B and thereafter it moves over the frictionless inclined plane. If there is friction on horizontal surface with $\backslash (\backslash$mu$\_\{\backslash$mathrm$\{$k$\}\}=0\mathrm{.}2\backslash ),$ find the speed of the object at point C $.$