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Calculate the acceleration of the block B in the above figure, assuming the surfaces and the pulleys \( P_{1} \) and
\( \mathrm{P} \)
W \( P_{2} \) are all smooth and pulleys and string and light
(1) \( \quad a=\frac{3 F}{20 m} \mathrm{~m} / \mathrm{s}^{2} \)
(2) \( a=\frac{3 F}{21 m} \mathrm{~m} / \mathrm{s}^{2} \)
(3) \( \quad a=\frac{2 F}{21 m} \mathrm{~m} / \mathrm{s}^{2} \)
(4) \( a=\frac{3 F}{18 m} \mathrm{~m} / \mathrm{s}^{2} \)
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