A box of weight Fg=2N accelerates down a rough plane that isinclined at an angle %u03C6=30 degrees above the horizontal, as shown. The normal force acting on the box has a magnituden=1.7, the coefficient of kinetic friction between the box and theplane is %u03BCk=0.3, and the displacement d of the box is1.8 m down the inclined plane.
What is the work Wgrav done on the box by gravity?