A block with a mass of 2.6 kg is free to slide along a horizontal frictionless tabletop. A spring with a spring constant k = 3500 N/m is attached to a wall on the left of the block, and the block is pushed against the spring, compressing it by a distance of 4.3 cm. The block is then released at rest, and it starts moving to the right as it is pushed by the spring. Since the block is not attached to the spring, it eventually leaves the spring. After the mass has left the spring, what is its speed?