where d is the distance the object falls g is the acceleration due to gravity t is the time considered t² is t times t or t-squared gt²/2 is g times t-squared divided by 2
so 75 feet = (32.17 feet/seconds²)t²/2
(32.17 feet/seconds²)t² = 150 feet t² = 150 feet / 32.17 feet/seconds² t² = 4.6627293 seconds² t = 2.1593354 seconds