A) (a ) \[\frac{PQ+PR+QR}{3}\]
B) \[\frac{PQ+PR}{3}\]
C) \[\frac{PQ+QR}{3}\]
D) \[\frac{PR+QR}{3}\]
Correct Answer: B
Solution :
\[{{r}_{1}}=0,\,{{r}_{2}}=PQ,{{r}_{3}}=PR\] Distance of centre of mass form P is \[r=\frac{{{r}_{1}}+{{r}_{2}}+{{r}_{3}}}{3}=\frac{0+PQ+PR}{3}=\frac{PQ+PR}{3}\]
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