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Question: Which of the following is the best evidence that work has been done on or by an object? The velocity of the object remains constant. The mass of the object has changed. The energy of the object has changed. The direction the object is moving remains constant.
The best evidence that work has been done on or by an object is that "The energy of the object has changed." This is because the concept of work in physics is the process of energy transfer through force applied across a displacement. If energy has been transferred, you can conclude work has been done. Changes in velocity or direction can indicate work, but not always, as these can remain constant even when work is done (as in the case of circular motion). And mass should not change due to work done on or by an object based on the law of conservation of mass.
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