h = -32*(1/2)*t^2 +vt +s
note: the 32 is because 32 ft / sec^2 is the acceleration due to gravity on Earth.
note: the acceleration is negative because gravity is pulling the object back down
note: the (1/2)*t^2 is because of something called integrals and derivatives, which you'll learn about in calculus
96 = -16t^2 + 80t +0
16t^2 -80t +96 = 0
all three numbers are divisible by 16 so
t^2 -5t +6 = 0
(t-3)(t-2) = 0
t = 2 and 3
Answer: t = 2 seconds (on the way up) and t = 3 seconds (on the way down)