Particles of masses m,2m,3m,...(n)m grams are placed on the same line at distances l,2l,3l,...(n)l cm from a fixed point. The distance of the centre of mass of the particles from the fixed point in centimetres is:
A
(2n+1)l3
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B
ln+1
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C
n(n2+1)l2
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D
2ln(n2+1)
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Solution
The correct option is A(2n+1)l3
Distance of center of mass=m1x1+m2x2+......m1+m2+....\\