A) 40 cm
B) 45 cm
C) 50 cm
D) 30 cm
Correct Answer: A
Solution :
\[{{x}_{CM}}=\frac{{{m}_{1}}{{x}_{1}}+{{m}_{2}}{{x}_{2}}={{m}_{3}}{{x}_{3}}}{{{m}_{1}}+{{m}_{2}}+{{m}_{3}}}\] |
\[=\frac{300(0)+500(40)+400(70)}{300+500+400}\] |
\[=\frac{20000+28000}{1200}\] |
\[=\frac{48000}{1200}\] |
\[=40\,cm\] |
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