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 the figurc-2.132. 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?
img src=https://penpencil-static-content.s3.ap-south-1.amazonaws.com/5eb393ee95fab7468a79d189/v9l9x4qjpp271aiid9i0kj2qc.png /
(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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