Why are we talking about the algebraic sum of works? Let the change in the kinetic energy of the body be zero.

Why are we talking about the algebraic sum of works? Let the change in the kinetic energy of the body be zero. In this case, can the work of the forces acting on it be different from zero?

If the change in the kinetic energy of a body is equal to zero, the work of the forces acting on it may be different from zero, but if the forces act in different directions, the algebraic sum of these works may be zero.

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