Mark's physics book is on the desk. Mark pushes horizontally (from the side) on the book, but the book does not move. Diagram A shows a box with a downward and upward arrow equal in size Diagram B shows a box with an arrow up, down, left, and right all equal in size. Diagram C shows a box with shortest arrow pointing left, equal arrows pointing up and down, and longest arrow pointing right. Diagram D shows a box with a downward and upward arrow with the downward arrow larger in size. Which force diagram represents the force on the physics book? You may neglect air resistance.

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j