Block $C$ of mass $m$ as shown in figure. Find the acceleration of block $B$.
- A$a =\frac{3 F }{21 m }\,m / s ^2$
- B$a =\frac{3 F }{20 m }\,m / s ^2$
- C$a=\frac{2 F}{21 m }\,m / s ^2$
- D$a=\frac{3 F}{18 m}\,m / s ^2$
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