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Linear mass density of rod of length l i...

Linear mass density of rod of length `l` is directly proportional to `x^(3)`, where `x` is distance from one end of rod. Centre of mass of rod lies at a distance

(1) `(4)/(5)l`
(2) `(5)/(4)l`
(3) `(2)/(3)l`
(4) `(3)/(2)l`

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