While setting up a fireworks
display, you have a tool at the top of the
building and need to drop it
to a coworker below. Given the equation:
h(t) = -16t^2 + h0
h = 84 feet
it will take the tool to fall
to the ground 2.29 time unit
-84 = -16t^2 – 0
t = 2.29 time unit
