Two conditions must be fulfilled for work to be done. Which is one of them?

Question

Two conditions must be fulfilled for work to be done. Which is one of them? — Exam MCQ

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B. The object must be displaced. — Mechanical work requires an applied force and displacement with a component along it.

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A. Force is not required.

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C. There should be no absorption or emission of energy.

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D. There should be no change in the object's condition.