In which case is work not done?

Question

In which case is work not done? — Exam MCQ

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B. A donkey carries a load on its back. — For horizontal carrying at constant height, the vertical supporting force is perpendicular to displacement and does zero work.

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A. A windmill raises water from a well.

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C. Suman swims in a pool.

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D. An engine pulls a train.

In which case is work not done?

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