Three identical spheres, each of mass 1 kg are kept as shown in figure, touching each other, with their centres on a straight line. If their centres are marked P, Q, R respectively, the distance of centre of mass of the system from P is

Q: Three identical spheres, each of mass 1 kg are kept as shown in figure, touching each other, with their centres on a straight line. If their centres are marked P, Q , R respectively, the distance of centre of mass of the system from P is

Numerical

(a) (PQ+PR+QR)/3

(b) (PQ+PR)/3

(c) (PQ+QR)/3

(d) (PR+QR)/3

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Ans: (b)