Luca is in a culvert below street level. He launches an object at an upward velocity of 40 feet per second. Use GeoGebra to graph the situation using the formula y= -16t2 + 40t - 5. How far above or below street level is Luca's initial launching point?
• 5 feet above
• 0 feet above or below
• 5 feet below
• 2.5 feet below
To determine how far above or below street level Luca's initial launching point is, we need to find the y-intercept of the graph of the equation y = -16t^2 + 40t - 5.
Using GeoGebra to graph the equation y = -16t^2 + 40t - 5, we can see that the y-intercept is at (0,-5). This means that Luca's initial launching point is 5 feet below street level.
Therefore, the correct answer is: 5 feet below.