Answer:
Work
Explanation:
The definition of work in physics is, the measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement.
Therefore, the work that's been done causes a change in the overall energy of the system. It's what causes the change from potential to kinetic.
Work caused the energy change from kinetic to potential when the spring was compressed.
This is defined as measure of energy transfer which occurs when an object is moved as a result of an external force.
The spring was compressed which caused the movement and energy transfer thereby depicting work done and makes option A the correct choice.
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