Math please help me

Question

Use the foemila below to solve the given problem. In the formula, d represets the distance and object falls, in feet and t repersents the time that an object falls, in seconds. Do not include units in your answer. A penny is dropped from the top of a building and takes 5 seconds to fall to the ground what is the height of the building square root d =4t

Answer 1

5 seconds to hit the ground

how high was the building where they dropped it?

d(t) = -16t^2 + vot + do where do = the initial height, and vo = 0 = initial velocity

d(5) = 0 = -16(5)^2 + do

do = 16(25) = 400 feet = initial height where they dropped the penny at time t=0, hitting the ground 5 seconds later, at time t=5