1.

Particle 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 the particles from the fixed point in centimeters is :

Answer»

`((2n+1)L)/(4)`
`(L)/((2n+1))`
`(n(n^(2)+1)L)/(2)`
`((2n+1)L)/(3)`

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