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11. Three identical spheres, each of mass 1 kg are placed touching each other with their centres on a straight line. Their centres are marked K, L and M respectively. The distance of centre of mass of the system from K is

(a)   (KL+KM+LM)/3

(b)  (KL+KM)/3

(C)  (KL+LM)/3

(d)  (KM+LM)/3

Ans. b

(35)

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