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The system shown in figure is released from rest with mass \( 2 \mathrm{~kg} \) in contact with the ground. Pulley and spring are massless, and friction is absent everywhere. The speed of \( 5 \mathrm{~kg} \) block when \( 2 \mathrm{~kg} \) block leaves the contact with the ground is (force constant of the spring \( k=40 \mathrm{Nm}^{-1} \) and \( \left.g=10 \mathrm{~m} \mathrm{~s}^{-2}\right) \)
(1) \( \sqrt{2} \mathrm{~ms}^{-1} \)
(2) \( 2 \sqrt{2} \mathrm{~ms}^{-1} \)
(3) \( 2 \mathrm{~ms}^{-1} \)
(4) \( \sqrt{2} \mathrm{~ms}^{-1} \)
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