Determine the total work of forces that will be perfect if a force equal to 3 N lifts a weight of 100 kg to a height of 5 m.

Suppose that the load rests on a horizontal surface, and the force that lifts the load is directed vertically upward. Then we find the vector sum of forces (gravity and lifting force):
F = Flift-Ftight = 3-100 * 10 = 3-1000 = -997N
A = module F * S = F * h = 997 * 5 = 4985J

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