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Two identical blocks A and B each of mass 10 \( \mathrm{kg} \) are joined together with an spring of \( \mathrm{P} \) unknown stiffness, as shown in figure. The W coefficient of friction between each block and surface is \( 0.1 \). The block \( B \) is pulled with a force of \( 40 \mathrm{~N} \) and the block \( \mathrm{A} \) accelerates with \( 1.2 \mathrm{~ms}^{-2} \). The acceleration of block \( \mathrm{B} \) is :-
(1) \( 1.2 \mathrm{~ms}^{-2} \)
(2) \( 1.8 \mathrm{~ms}^{-2} \)
(3) \( 0.8 \mathrm{~ms}^{-2} \)
(4) \( 1.5 \mathrm{~ms}^{-2} \)
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