1. A block of mass m is placed on top of a light vertical spring of force constant k and pushed downward, so that the spring is compressed by x. After the block is released from rest it travels upward and then leaves the spring. To what maximum height above the point of release does it rise? (A)kx²/(mg) (B)2kx²/(mg) (C)kx²/(2mg) (D)kx²/(√2 mg) (E)√2 kx²/(mg)