Question

A projectile that was launched straight up from the ground with an initial velocity of 48 ft/s returned to the ground after 3 s. The height of the projectile t seconds after launch is modeled by the function f(t)=−16t2+48t . What is the maximum height of the projectile, in feet? Enter your answer in the box.

Answer 1

 
h(t) = -16t^2 + 128t  since this equation is quadratic, it's maximum must occur at its VERTEX!! 

Answer 2

I got 24 feet. Could be right or wrong, idk