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In the figure shown, initially spring is in unstretched state and blocks are at rest. Now \( 100 \mathrm{~N} \) force is applied on block \( A \) and \( B \) as shown in figure. After some time velocity of \( A \) becomes \( 2 \mathrm{~m} / \mathrm{s} \) and that of \( B 4 \mathrm{~m} / \mathrm{s} \) and block \( A \) displaced by amount \( 10 \mathrm{~cm} \) and spring is stretched by amount \( 30 \mathrm{~cm} \). Then work done by spring force on \( A \) will be:
(1) \( 9 / 3 \mathrm{~J} \)
(2) \( -6 \mathrm{~J} \)
(3) \( 6 \mathrm{~J} \)
(4) None of these
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