A system shown in figure is released from rest with mass \( 2 \math...

A system shown in figure is released from rest with mass \( 2 \mathrm{~kg} \) in contact with the ground. Pulley and spring
\( \mathrm{P} \) are massless, and friction is absent everywhere the speed of \( 5 \mathrm{~kg} \) block
W when \( 2 \mathrm{~kg} \) block leaves the contact with the ground is \( \mathrm{m} / \mathrm{s} \). (Force constant of the spring \( k=40 \mathrm{~N} \mathrm{~m}^{-1} \) and \( g=10 \mathrm{~m} \mathrm{~s}^{-2} \) )