It is easy to fall off the cliff, but it has nothing to do with the above data. However, this is a physics problem, not a math problem.
The formula seems to be: the acceleration of gravity times the square of time, and the acceleration of gravity seems to be 9.8.
Then this is: 9.8×1.4×1.4 =19.208 (m).
No guarantee. Yes Mislisten.