A uniform cable of mass 
and length 
is placed on a horizontal surface such that its 
part is hanging below the edge of the surface. To lift the hanging part of the cable upto the surface, the work done should be:
Text Solution
Verified by ExpertsB
JEE Main 2019
Length of hanging part 
Mass of hanging part 
Weight of hanging part 
Let 
be the centre of mass of the hanging part.
The hanging part can be assumed to be a particle of weight 
at a distance 
below the table top. The work done in lifting it to the table top is equal to increase in its potential energy.
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