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Q.

Three identical spheres each of  radius R are placed touching each other on a horizontal table as shown in figure. The co-ordinates of centre of mass are:

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a

(R, R)

b

(0, 0)

c

(R2, R2)

d

(R, R3)

answer is D.

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Detailed Solution

xcm = m×0+m×2R+mR3m = Rycm = m×0+m×0+mR33m = R3
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