Question

A model rocket is launched from a raised platform at a speed of 144 feet per second. Its height in feet is given by h(t) = -16t 2 + 144t + 20 (t = seconds after launch). After how many seconds does the object reach its maximum height? 20 seconds
6.5 seconds
2.25 seconds
4.5 seconds

Answer 1

I think its 4.5 seconds