Some crosswalk lights flash red as a warning to pedestrians not to cross the street (see photo below). What is the period of a flashing crosswalk that has a frequency of 1.5 Hz? Explain. Some crosswalk lights flash red as a warning to pedestrians not to cross the street (see photo below). What is the period of a flashing crosswalk that has a frequency of 1.5 Hz? Explain.

False is correct on edgenuity

You're asking in the ap section, so i'll give the ap calculus-style answer. alternatively, you can find the vertex of the parabola and use the "y"-coordinate as the answer.

the maximum height can occur at a critical number, that is, a number  such that  .

the derivative of  can be calculated as follows:



find a value of  that is a zero of the derivative:


this is parabola that is opening downward; we can assume there is a maximum at  .

to find that maximum, calculate  .