Q.
Three particles of masses 2 kg, 3 kg and 4 kg are placed at the vertices A, B and C of an equilateral triangle ABC. If A and B lie at (0,0) and (2,0) m, the co-ordinates of their centre of mass are
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a
(32m and 76m)
b
(109m and 439m)
c
(712m and 34m)
d
(712m and 712m)
answer is B.
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Detailed Solution
. xcm=m1x1+m2x2+m3x3m1+m2+m3 XCM=2(0)+3(2)+4(1)9=6+49=109 Ycm=2(0)+3(0)+4(3)9 =439 xcm,ycm=109,439
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