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Q.

A rod consists of two parts made up of homogeneous material with square type cross –  section

as shown. The position of  C.M from the end ‘O’ is

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a

15 cm

b

653 cm

c

553 cm 

d

353 cm

answer is A.

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Detailed Solution

m=v×e=Al×e

⇒m∝Al

xcm=m1x1+m2x2m1+m2

=A1l1x1+A2l2x2A1l1+A2l2

=80×4×10+20×2×2580×4+20×2

=3250+1000320+40=4200360

=353

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