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college physics

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A ball is thrown from a 20.0m high building and hits the ground 6.0m from the building. With what horizontal velocity was it thrown?

  • college physics - ,

    h = ho - (Vo*t + 0.5g*t^2) = 0.
    20 - (0 + 4.9t^2) = 0
    20 - 4.9t^2 = 0
    -4.9t^2 = -20
    t^2 = 4.08
    Tf = 2.02 s. = Fall time.

    Range = Xo * Tf = 6 m.
    Xo*2.02 = 6
    Xo = 2.97 m/s. = Initial hor. velocity.

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