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

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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 \(F=200 N\) as shown in figure. If at some instant the \(10 kg\) mass has acceleration of \(12 m / s ^2\), what is the acceleration of \(20 kg\) mass?
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