A uniform chain of length 3m is kept on a table such that a length 1m hangs freely from the edge of the table. The total mass of chain is 6kg. The work done in pulling the entire chian to the table will be: (Take g=10m/s2)

a) 5J

b) 10J

c) 15J

d) 20J

Kindly answer soon.

The work done is equal to the potential energy of the haning part

so,

W = mgh

here,

m = mass of hanging chain = (1/3) x 6 = 2 kg 

h = position of center of gravity of hanging chain = 1/2m = 0.5m

so,

W = 2 x 10 x 0.5

thus,

W = 10 J

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