Final answer:
The vertical distance from the grade plane to the average height of the highest roof surface is called the altitude or vertical position above the starting point. This is the highest point in any trajectory, also known as the apex.
Step-by-step explanation:
The vertical distance from the grade plane to the average height of the highest roof surface is called the altitude or vertical position above the starting point. This is the highest point in any trajectory, also known as the apex. To find the height, you can use the equation v² = v² - 2g(y - yo), where v represents velocity, g is the acceleration due to gravity, y is the vertical position, and yo is the initial position.