Projectile motion

1. Mar 16, 2010

magnifik

1. The problem statement, all variables and given/known data
A cannon ball is fired with speed v0 at an angle phi above the horizontal. The launch point is at height h above the ground. Find the time to hit the ground, and the magnitude of the velocity when the ball hits the ground (in terms of v0, g, h, $$\phi$$)

2. Relevant equations
y=v0sin($$\phi$$)t - 1/2gt^2
vy=v0sin($$\phi$$) - gt

3. The attempt at a solution
how do i account for initial height?

2. Mar 16, 2010

rock.freak667

y=y0+v0sin(φ)t - 1/2gt2