Q.

A rigid body consists of a 3kg mass located at r→1=(2i^+5j^)m and a 2kg mass located at r→2=(4i^+2j^)m The position of centre of mass is

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a

145j^+195i^m

b

145i^+195j^m

c

195i^+145j^m

d

0

answer is B.

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Detailed Solution

r→cm=m1r→1+m2r2→m1+m2
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A rigid body consists of a 3kg mass located at r→1=(2i^+5j^)m and a 2kg mass located at r→2=(4i^+2j^)m The position of centre of mass is