Question

A projectile is launched horizontally from the edge of a cliff 20 m high with an initial speed of 10 m/s. What is the horizontal distance the projectile travels before striking the ground below the cliff?

Answer 1

first we will find time v=u+at

                                  0=10-10t

                                 -10=-10t

t=1s

s=10+5

s=15m