A baseball is hit upward from 4 ft with initial velocity 80 ft/s. Height: h(t) = −16t² + 80t + 4. What is the maximum height?
A 104 ft
B 100 ft
C 80 ft
D 84 ft
Explanation
Vertex at t = −80/(−32) = 2.5. h(2.5) = −16(6.25) + 200 + 4 = −100 + 204 = 104 ft.