# Homework Help: Projectile HELP

1. Sep 27, 2010

### huz521

Projectile HELP!!!

1. The problem statement, all variables and given/known data
NOTE: IN THIS QUESTION, BILL KICKS
THE ROCKS HORIZONTALLY.
Bill kicks a rock oﬀ the top of his apartment
building. It strikes a window across the street
14 m away.
The acceleration of gravity is 9.8 m/s
2
.
If the window is 16 m below the position
where Bill contacted the rock, how long was
it in the air?
How fast was it moving when it left Bill’s
foot?
2. Relevant equations

3. The attempt at a solution

2. Sep 27, 2010

### iRaid

Re: Projectile HELP!!!

(delta)y = v0t - 1/2gt^2

just plug in the numbers

3. Sep 27, 2010

### fizzynoob

Re: Projectile HELP!!!

>>just plug in the numbers

but thats not how you understand the physics of the problem.

Think about the question at hand and try to figure what is actually going on.

[PLAIN]http://img237.imageshack.us/img237/641/blockfc.png [Broken]

V initial has only a horizontal component which equals its total magnitude.