# Homework Help: Trajectory of a projectile from a cliff

1. Sep 8, 2009

### Kris1120

1. The problem statement, all variables and given/known data
A projectile is shot from the edge of a cliff 115 m above ground level with an initial speed of 65.0 m/s at an angle of 35.0 degrees with the horizontal.
A. Determine the time taken by the projectile to hit point P at ground level.
B. Determine the distance X of point P from the base of the vertical cliff.
C.At the instant just before the projectile hits point P, determine the horizontal and the vertical components of its velocity.
D. At the instant just before the projectile hits point P, determine the angle made by the velocity vector with the horizontal.
E. Find the maximum height above the cliff top reached by the projectile.

2. Relevant equations

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3. The attempt at a solution

I got t= 9.96 s for A which was right and I got delta x= 531 m for B which was right. I am stuck at C. I can't even find an equation to use in my book or in my notes. Someone please point me in the right direction!

2. Sep 8, 2009

### lanedance

Re: Projectile

which direction does gravity act? is there any forces assumed in this example that would cause a horizontal acceleration?