Question

A man (80kg) jumps from a 17 storey balcony (51 metres). How long would it take for him reach the ground?

~Sorry for the morbid example, we were just having a chat about it lol

Answer 1

h+g*t^2/2
t=sqrt(2h/g)
=sqrt(2*51/9.8)
= 3.2 sec

Answer 2

Assuming air resistance is negligible.