The 50-kg block at \(A\) is mounted on rollers so that it moves along the fixed horizontal rail with negligible friction under the action of the constant 300-N force in the cable. The block is released from rest at \(A\), with the spring to which it is attached extended an initial amount \(x_{1}=0.233 \mathrm{~m}\). The spring has a stiffness \(k=80 \mathrm{~N} / \mathrm{m}\). Calculate the velocity \(v\) of the block as it reaches position \(B\).

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A 1.2 m -x1 C B 300 N 0.9 m