A 4 kg block is attached to a horizontal spring, which is attached to wall (as shown). The spring has a stiffness of 1600 N/m and a relaxed length of 0.15 m. You pull the mass until the stretch of the spring is 0.08 m and release it from rest. The block begins to oscillate with negligible friction What is the block's speed when the stretch of the spring is 0.06 m?

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