F = 3 N.
g = 9.8 m / s ^ 2.
m = 100 g = 0.1 kg.
h = 5 m.
The work of force A is determined by the formula: A = F * S * cosα, where F is the force that acts on the body, S is the displacement under the action of the force, ∠α is the angle between force F and displacement S.
Two forces act on the body: gravity m * g, directed vertically downward, and the tension force of the rope F, for which the load is lifted, directed vertically upward.
The work of gravity: At = m * g * h * cos180 ° = 0.1 kg * 9.8 m / s ^ 2 * (- 1) = – 0.98 J.
The work of the rope pulling force: An = m * g * h * cos0 ° = 0.1 kg * 9.8 m / s ^ 2 = 0.98 J.
A = At + An.
A = 0.98 J – 0.98 J = 0.
Answer: the total work of forces is equal to 0: A = 0.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.