Explanation:
"how long" is the question.
so, we will need an answer in seconds.
the other options do not define a time duration.
to fall from top to the ground it means the object fell 1503 ft, that means that s(t) = 1503.
16t² = 1503
t² = 1503/16
t = sqrt(1503/16) = sqrt(9×167/16) = 3/4 × sqrt(167) =
= 9.692135987... seconds
it took the object 9.692135987... seconds to fall from the top to the ground.