Need help solving a math problem

Question

A ball is thrown vertically upward. After t seconds, its height h (in feet) is given by the function h(t)=48t-16r^2 after how long will it reach its maximum height?

Answer 1

The equation is 48t-16t² and the maximum occurs when t=3/2.

The vertex of the general quadratic equation occurs when x = -B/2A.