Suppose a Ball Is Thrown into the Air and After $h ( t ) = - 16 t ^ { 2 } + 80 t$

Multiple Choice

Suppose a ball is thrown into the air and after t seconds has a height of $h ( t ) = - 16 t ^ { 2 } + 80 t$ feet. When will it reach its maximum height?

A) 5 sec
B) 300 sec
C) 0.5 sec
D) 2.5 sec
E) none of these