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

Particles of masses m, 2m, 3m ... nm gram are placed on the same line

1.	Particles of masses m, 2m, 3m ... nm gram are placed on the same line at distance l, 2l, 3l, ..., nl cm from a fixed point. The distance of centre of mass of the particles from the fixed point in cm is
Answer» `((2n+1)l)/(3)` `(l)/(n+1)` `(n(n^(2)+1)l)/(2)` `(2L)/(n(n^(2)+1))` ANSWER :A