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
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a