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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
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The mass of a uniform ladder of length 5 m is 20 kg. A person of mass 60 kg stands on the ladder at a height of 2 m from the bottom. The position of centre of mass of the ladder and man from the bottom nearly is
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