Two blocks of masses \( m=2 \mathrm{~kg} \) and \( m=8 \mathrm{~kg} \) are connected to a spring...

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Two blocks of masses \( m=2 \mathrm{~kg} \) and \( m=8 \mathrm{~kg} \) are connected to a spring of force constant \( k=1 \mathrm{kN} / \mathrm{m} \). The spring is compressed by \( 20 \mathrm{~cm} \) and the two blocks are held in this position by a string. The system is placed on a horizontal smooth surface and given a velocity \( u=3 \mathrm{~m} / \mathrm{s} \) perpendicular to the spring. The string snaps while moving. The speed (in \( \mathrm{m} / \mathrm{s} \) ) of the block of mass \( m \) when the spring regains its natural length is
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