Physics .
posted by Allison .
A projectile is shot horizontally at 220 m/s from the top of a 620 m high cliff.
A) How long till the projectile hits the ground?
B) How far from the base of the cliff does the projectile land?
I am gonna be honest. I have no idea how to do any of my Physics homework. ): I still have 3 more questions to do too outta 5.

Split this into two problems. Since the projectile starts horizontal it keeps its horizontal speed. There is no horizontal force to change that speed.
On the other hand it starts with no vertical speed but there is a vertical force, gravity. Therefore it accelerates down at 9.8 m/s^2
A) is just a falling problem
h = (1/2) g t^2
620 = 4.9 t^2
t = 11.25 seconds
B) It goes for 11.25 seconds at 220 m/s
11.25*220 = 2475 
thank you soooooo much(: