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JEE Main Physics question

PhysicsWork, Energy and PowerJEE Main

A chain of mass M is placed on a smooth table with 1/3 of its length L hanging over the edge. The work done in pulling the chain back onto the table is

Answer: (D)

Solution

The hanging length is L/3, with mass M/3 and its centre of mass at (L/3)/2 = L/6 below the table edge. Work = (M/3)g(L/6) = MgL/18.

Question ID VK-153692