Homework Help: Physics

Posted by Katie on Monday, June 18, 2012 at 5:12pm.

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 y-direction of the ball with any given values substituted.

Write down the algebraic position equation for the y-direction of the ball with any given values substituted.

So I need to equations for vertical velocity (Vy) and vertical position (y)

Physics - Henry, Tuesday, June 19, 2012 at 12:15pm
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.

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