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The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy. In other words, the net work done on an object is equal to the change in its motion.
Work refers to the transfer of energy that occurs when a force is applied over a distance.
Kinetic energy is the energy possessed by an object due to its motion.
Net force is the vector sum of all forces acting on an object, which determines its acceleration or deceleration.