Answer
There are two forces acting on the beam. The force of gravity points straight down. The tension force from the cable points straight up. Because the beam is being lowered at a steadily decreasing speed, the tension force is greater in magnitude than the force of gravity.
Work Step by Step
There are two forces acting on the beam. The force of gravity points straight down. The tension force from the cable points straight up. Because the beam is being lowered at a steadily decreasing speed, the tension force is greater in magnitude than the force of gravity. Note that the rectangle in the free body diagram represents the beam.