Question

Paula kicks a ball off the ground into the air. The height, in feet, of the ball t seconds after it is kicked is modeled by the function h(t) = -16t2 +80t. How long after the kick will it take for the ball to reach its maximum height?

Answer 1

2.5s

Explanation:

At maximum height, dy/dx=0

dy/dx=-32t+80=0

32t=80

t=80/32

t=2.5s