- (C) From Answer 4
s(t) = −16t^2 + 40t + 96.
Then
s ′(t) = −32t + 40,
which is zero if t = 5/4, and that yields maximum height, since s ′′(t) = −32.
s(t) = −16t^2 + 40t + 96.
Then
s ′(t) = −32t + 40,
which is zero if t = 5/4, and that yields maximum height, since s ′′(t) = −32.