Chapter$-6)$: Three forces: $F_1=20\mathrm{.}0N,F_2=40\mathrm{.}0N,$ and $F_3=10\mathrm{.}0N$ act on an object with a mass of $2\mathrm{.}00$ kg which can move along a frictionless inclined plane as shown in the figure. The questions refer to the instant when the object has moved through a distance of $0\mathrm{.}600$ m along the surface of the inclined plane in the upward direction. Calculate the amount of work done by

$($a$)F_1=?$

$($b$)F_2=?$

$($c$)F_3=?$