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Q.

A chain of mass m and length ‘L’ is over hanging from the edge of a smooth horizontal table such that 3/4th of its length is lying on the table. The work done in pulling the chain completely on to the table is

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a

mgL/16

b

mgL/32

c

3mgL/32

d

mgL/8

answer is B.

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Detailed Solution

WORK done   W =Mg l2n2         where l/n = length of the chain hanging at the edge given l/n = l / 4 work done     w= Mg l32
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