Calculate the acceleration of the block B in the above figure, assuming the surfaces and the pulleys $P_1$ and $P_2$ are all smooth and pulleys and string and light
- A$a =\frac{3 F }{17 m } m / s ^2$
- B$a=\frac{2 F }{17 m } m / s ^2$
- C$a=\frac{3 F }{15 m } m / s ^2$
- D$a =\frac{3 F}{12 m } m / s ^2$
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