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Calculate the acceleration of the block B in the above figure, assuming the surfaces and the pulleys \( P_{1} \) and
\( \mathrm{P} \) \( P_{2} \) are all smooth and pulleys and string are light

W
(1) \( a=\frac{3 F}{17 \mathrm{~m}} \mathrm{~m} / \mathrm{s}^{2} \)
(2) \( a=\frac{2 F}{17 m} \mathrm{~m} / \mathrm{s}^{2} \)
(3) \( a=\frac{3 F}{15 m} \mathrm{~m} / \mathrm{s}^{2} \)
(4) \( a=\frac{3 F}{12 m} \mathrm{~m} / \mathrm{s}^{2} \)
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