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Q.

[[1]] work was done by a coolie to carry the load on his head.


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Detailed Solution

Zero work was done by a coolie to carry the load on his head.
Collie is applying force in the perpendicular direction to carry the load on his head and moving in the horizontal direction, so the net work done will be zero since force and displacement are in the perpendicular direction. Coolie did nothing to help with the luggage. A coolie travelling on a horizontal platform without friction while carrying a load on his head is not doing any work.
 
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