First, we use the kinematic equation X = Xo + Vot + 1/2 at^2 to find the total time it takes to reach the ground.
-75.1 = 0 + 0 + -4.9t^2
Solving for t we get 3.9 seconds.
Next, we subtract 1.2 seconds from 3.9 seconds to get 2.7s.
Then we use the original equation again with x as the final displacement and 2.7 as time
x = -4.9*2.7^2
x = -35.7m
To find out how far from the ground it is, simply do 75.1m - 35.7m = 39.4m
39.4m is the final answer.
