Posted by Katie on .
At time t = 0, you shoot a cannonball horizontally from the roof of a building at a velocity of 10 m/s. The building has a height of 80 m. Assume g = 10 m/s2 and that there is no air resistance.
Write down the algebraic velocity equation for the ydirection of the ball with any given values substituted.
Write down the algebraic position equation for the ydirection of the ball with any given values substituted.
So I need to equations for vertical velocity (Vy) and vertical position (y)

Physics 
Henry,
1. V^2 = Vo^2+ 2g*d.
V^2 = 0 + 20*80 = 1600
V = 40 m/s^2.
2. h = ho  0.5g*t^2
h = 80  5*(0)^2 = 80 m.
80  5t^2 = 0
5t^2 = 80
t^2 = 16
t = 4 s. = Fall time.