1.

For the system shown in figure, the correct expression is

A. \[{{F}_{3}}={{F}_{1}}+F{{  }_{2}}\]  
B. \[{{F}_{3}}=\frac{{{m}_{3}}F}{{{F}_{1}}+F{{  }_{2}}+{{F}_{3}}}\]
C. \[{{F}_{3}}=\frac{{{m}_{3}}F}{{{m}_{1}}+{{m}_{2}}+{{m}_{3}}}\]         
D. \[\,{{F}_{3}}=\frac{{{m}_{3}}F}{{{m}_{1}}+{{m}_{2}}}\]
Answer» D. \[\,{{F}_{3}}=\frac{{{m}_{3}}F}{{{m}_{1}}+{{m}_{2}}}\]


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