A horizontal spring with spring constant 50 newtons per meter is attached to a 5-kilogram block and is stretched to 5 meters from the equilibrium point. Once let go, the maximum velocity of the block is v1. If another spring of spring constant 75 newtons per meter is attached in series to the previous spring, and the composite is stretched to 5 meters from equilibrium with the same block attached, it will experience a maximum velocity of v2. What the ratio of v1 to v2?