Question

A ball is dropped from the top of a 253-foot
building.
How many seconds will it take to hit the
ground if the height is given by
h=-16t^2+s
where s is the initial height?
answer in unit of seconds

Answer 1

253 feet= 77.114 meters. and accel due to gravity = -9.8 m/s^2
final height = 0m
0m= 1/2(-9.8)t^2+0t+77.114
t=3.9607 seconds

Answer 2

thanks!