Consider the situation depicted above, in which a red box slides along a

frictionless track. The box is initially moving at speed v = 7.6 m/s. It then

traverses an interesting curved portion of track before ultimately

reaching the horizontal piece of track at right in the diagram. If the

vertical distance between the upper and lower pieces of horizontal track

is h = 18.7 meters, determine how fast the box is moving when it gets to

the lower horizontal portion of track. Express your answer in m/s.