A man carrying on his head moves:
I)horizontally,
ii) in the vertical direction.
Which case, the work is done? Give reasons.

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Solution

The work is done when he moves vertically but no work is done when he moves horizontally.
The reason behind this is that while moving vertically he has to work against gravity but while moving horizontally he don't have to, since there is no horizontal force acting against him.

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A man carrying on his head moves:I)horizontally,ii) in the vertical direction.Which case, the work is done? Give reasons.

The work is done when he moves vertically but no work is done when he moves horizontally. The reason behind this is that while moving vertically he has to work against gravity but while moving horizontally he don't have to, since there is no horizontal force acting against him.

A man carrying on his head moves:
I)horizontally,
ii) in the vertical direction.
Which case, the work is done? Give reasons.

The work is done when he moves vertically but no work is done when he moves horizontally.
The reason behind this is that while moving vertically he has to work against gravity but while moving horizontally he don't have to, since there is no horizontal force acting against him.