Final answer:
The vertical height that the sled reaches above its starting point can be determined using the equation v² = v², — 2g(y — yo).
Step-by-step explanation:
By "height" we mean the altitude or vertical position y above the starting point. The highest point in any trajectory, called the apex, is reached when vy = 0. Since we know the initial and final velocities, as well as the initial position, we use the following equation to find y: v² = v², — 2g(y — yo).