Answer:
Step-by-step explanation:
Atractive forces tries to stop objects when they try to escape of the influence of these forces. Examples of this situation are the gravitational force and electric force.
When the object loses speed, its speed is decreasing, that is, its kinetic energy is decreasing, because the kinetic energy depends on speed:
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this lost of kinetic energy is equilibrated by the increase of the potential energy generated by the atractive force.
Because of this dynamic between the kinetic energy and the potential energy, the total mechanical energy of the object is conserved.