Asked by sam

an object is projected upward at a rate of 96 feet per second. find the time when it is 144 feet above the ground
Answered by Reiny
h(t) = -16t^2 + 96t

144 = -16t^2 + 96t
t^2 - 6t + 9 = 0
(t-3)(t-3) = 0

t = 3