In the arrangement shown in figure, all pulleys are smooth and mass...

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In the arrangement shown in figure, all pulleys are smooth and massless. When the system is 2 and 3 relative to 1 are \( 1 \mathrm{~ms}^{-2} \) downwards and \( 5 \mathrm{~ms}^{-2} \) downwards, respectively. Acceleration of block 3 relative to 4 is zero.
Find the absolute acceleration of block 1 .
(1) \( 2 \mathrm{~m} \mathrm{~s}^{-2} \) upwards
(2) \( 1 \mathrm{~ms}^{-2} \) downwards
(3) \( 3 \mathrm{~ms}^{-2} \) upwards
(4) \( 1.5 \mathrm{~m} \mathrm{~s}^{-2} \) downwards
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