Two blocks \( A(2 \mathrm{~kg}) \) and \( B(3 \mathrm{~kg}) \) rest up on a smooth horizontal su...

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Two blocks \( A(2 \mathrm{~kg}) \) and \( B(3 \mathrm{~kg}) \) rest up on a smooth horizontal surface are connected by a spring of stiffiness \( 120 \mathrm{~N} / \mathrm{m} \). Initially the spring is undeformed. A is imparted a velocity of \( 2 \mathrm{~m} / \mathrm{s} \) along the line of the spring away from \( B \). Find the displacement of \( A \mathrm{t} \) seconds later.
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