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

Particles of masses m, 2m , 3m …..nm grams are placed on the same li

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