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Q.

Three masses are placed on x-axis; 1 kg at the origin, 2 kg at x = 5 cm and another 2 kg at x = 10 cm. The distance of centre of mass of the system from the origin is 

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a

20 cm

b

12 cm

c

10 cm

d

6 cm

answer is C.

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Detailed Solution

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Distance of centre of mass is given by 

Xcm=1×0+2×5+2×105=6 cm

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