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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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10 cm

12 cm

6 cm

20 cm

answer is C.

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Detailed Solution

Distance of centre of mass is given by

$X_{cm} = \frac{1 \times 0 + 2 \times 5 + 2 \times 10}{5} = 6 cm$

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