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March 25, 2017

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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 - ,

    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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