A uniform chain of length 2m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. The work done in pulling the entire chain on the table is (Take g = ms-2)

Mass of length 2 m of the chain = 4 kgMass of length 60 cm or 0.60 m of the chain = 4×0.602 = 1.2 kgWeight of the hanging part of the chain = 1.2 ×10 = 12 NSince of centre of gravity of the hanging part lies at its mid-point, i.e., 30 cm or 0.30 mW = 12×0.30 = 3.6 J