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33 A force, F, is applied to an object with a displacement, Ad. When does the equation W = FAd equal the work done by the force on the object? always when the force is in the same direction as the displacement when the force is perpendicular to the displacement when the force is at an angle of 45° to the displacement Question 2 (1 point) At a construction site, a constant force lifts a stack of wooden boards, which has a mass of 500 kg, to a height of 10 m in 15 s. The stack rises at a steady pace. How much power is needed to move the stack to this height? 1.9 x 102 W 3.3 x 102 W 3.3 x 103 W 1.6 x 104 W Question 3 (1 point) A mover pushes a sofa across the floor of a van. The mover applies 500 N of horizontal force to the sofa and pushes it 1.5 m. The work done on the sofa by the mover is 285 J 396 J 570J 750J