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Particles of masses m,2m,3m,…….nm grams ...

Particles of masses `m,2m,3m,…….nm` grams are placed on the same line at distance `l,2l,3l,……..nl` cm from a fixed point. The distance of centre of mass of mass particles from the fixed point in centimetres is on the line`:`

A

`((2n+1)l)/(3)`

B

`(l)/(n+1)`

C

`(n(n^(2)+1)l)/(2)`

D

`(2l)/(n(n^(2)+1)`

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The correct Answer is:
A
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