Block \( A \) of mass \( M=2 \mathrm{~kg} \) is connected to another block \( B \) of mass \( m=...

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Block \( A \) of mass \( M=2 \mathrm{~kg} \) is connected to another block \( B \) of mass \( m=1 \mathrm{~kg} \) with a string and a spring of force constant \( k=600 \mathrm{~N} / \mathrm{m} \) as shown in figure. Initially, spring is compressed to \( 10 \mathrm{~cm} \) and whole system is moving on a smooth surface with a velocity \( v=1 \mathrm{~m} / \mathrm{s} \). At any time, thread is burnt, the velocity of block \( A \), when \( B \) is having maximum velocity w.r.t. ground, is
(1) zero
(2) \( 1 \mathrm{~m} / \mathrm{s} \)
(3) \( 3 \mathrm{~m} / \mathrm{s} \)
(4) none of these
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