A vertical spring with force constant 180 N/m is compressed by an attached 15 Kg block at rest. A separate 10 Kg block glued to the 15 Kg block, and the combined 25 Kg mass is given a downward push of 4 meters per second. This push happens at the original location of the 15 Kg block. Calculate the distance (in meters) the mass goes down from the initial release to the lowest turn around point. Enter number only.