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Q.

Three masses are placed on the x -axis: 300 g at origin, 500 g at x = 40 cm and 400 g at x = 70cm, The distance of centre of mass from the origin is:

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a

45 cm

b

50 cm

c

40 cm

d

30 cm

answer is C.

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Detailed Solution

Xcm=m1x1+m2x2+m3x3m1+m2+m3

Xcm=300×0+500×40+400×701200=40cm

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