Question

An object is thrown from a height of 8.0m, with a horizontal velocity of 28.0m/s. How far will this object travel horizontally before hitting the ground?

Answer 1

t =sqrt(2h/g)
s =vt

Answer 2

I really did not get the formula
Please explain it to me

Answer 3

http://www.physicstutorials.org/home/mechanics/1d-kinematics/projectile-motion?start=1