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Rani went for a walk with her dog. Has any work done against gravity in terms of physical work ?

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No, as there is no force acting on Rani.

Yes, as she was tired.

None of these.

Yes, as she was displaced and force of gravitation is applied.

answer is D.

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Detailed Solution

No work is done against gravity because the displacement of Rani and force of gravitation acting on her are at right angle. Hence, work done against gravity is zero.

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