Pretty sneaky, I must say !
Work = (force) x (distance)
That formula says nothing about the directions of the force OR
the distance. As long as they're both in the same direction, they
can both be horizontal (sliding a crate on the floor), vertical (lifting
something), or on any slant in between.
Roger's force and distance are both in the same direction ... the
direction of the incline ... so
Work = (60 newtons) x (10 meters) = 600 joules.
