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

question 36

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