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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

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a

PQ+QR3

b

PQ+PR+QR3

c

PQ+PR3

d

PR+QR3

answer is B.

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Detailed Solution

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xcm=1×0+1×PQ+1×PR1+1+1=PQ+PR3 and ycm=0

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