Two blocks \( A \) and \( B \) attached to each other by a massless spring, are kept on a rough ...

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Two blocks \( A \) and \( B \) attached to each other by a massless spring, are kept on a rough horizontal surface \( (\mu=0.1) \) and pulled by a force \( F=200 \mathrm{~N} \) as shown in figure. If at some instant the \( 10 \mathrm{~kg} \) mass has acceleration of \( 12 \mathrm{~m} / \mathrm{s}^{2} \), what is the acceleration of \( 20 \mathrm{~kg} \) mass?
(a) \( 2.5 \mathrm{~m} / \mathrm{s}^{2} \)
(b) \( 4.0 \mathrm{~m} / \mathrm{s}^{2} \)
(c) \( 3.6 \mathrm{~m} / \mathrm{s}^{2} \)
(d) \( 1.2 \mathrm{~m} / \mathrm{s}^{2} \)
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