Masses of 2 kg each are placed at the corners B and A of a rectangular plate ABCD as shown in the figure. A mass of 8 kg has to be placed on the plate so that the centre of mass of the system should be the centre O. Then the mass should be placed at:
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a
1 m from O on OE
b
2 m from O on OF
c
2 m from O on OG
d
2 m from O on OH
answer is A.
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Detailed Solution
xcm = m1x1+m2x2+m3x3m1+m2+m3⇒0 = 2(-2)+2(-2)+8x22+2+8⇒x3 = 1 m