Three blocks \( A, B \) and \( C \) of masses \( 1 \mathrm{~kg}, 2 \mathrm{~kg} \) and \( 3 \mat...

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Three blocks \( A, B \) and \( C \) of masses \( 1 \mathrm{~kg}, 2 \mathrm{~kg} \) and \( 3 \mathrm{~kg} \) respectively are arranged as shown in the figure. The coefficient of friction between different surfaces are shown in figure. A force of magnitude \( 20 \mathrm{~N} \) acts on block \( B \) in horizontal direction. The acceleration of block \( A \) is
(1) \( 5 \mathrm{~m} / \mathrm{s}^{2} \)
(2) \( 8 / 3 \mathrm{~m} / \mathrm{s}^{2} \)
(3) zero
(4) none of these
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