The system as shown in the figure is released from rest. The pulley, spring and string are ideal...

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The system as shown in the figure is released from rest. The pulley, spring and string are ideal \& friction is absent everywhere. If speed of \( 5 \mathrm{~kg} \) block when \( 2 \mathrm{~kg} \) block leaves the contact with ground is \( 2 \sqrt{x} \mathrm{~m} / \mathrm{s} \), then value of \( x \) is (spring constant \( k=40 \mathrm{~N} / \mathrm{m} \) and \( g=10 \mathrm{~m} / \mathrm{s}^{2} \) )
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