A coolie X carries a load on his head and climbs up a slope. Another coolie, Y, carries the same load and moves by the same distance, but through a smooth horizontal surface. Then

both of them do same amount of work

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both of them do no work

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X does greater amount of work

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Y does greater amount of work

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Solution

The correct option is C X does greater amount of work
X does work against the gravity making some amount of vertical displacement along the slope. Y performs no work against the gravity moving in the horizontal direction as the displacement is perpendicular to force in case of Y. So, X does greater amount of work.

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