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Math Help - Another Velocity Question

  1. #1
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    Another Velocity Question

    " A stone is thrown vertically upward from the edge of a building 300 m high with an initial velocity of 10 m/s. Missing the building on the way down, what is the...

    A) Time of flight

    B) Velocity of the stone before impact with the ground

    I've got

    D= 300 m
    V0= 10 m/s
    A= 9.8 m/s^2
    T= ?
    V= ?

    I don't know the formula without those two variables, any help would be greatly appreciated.
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  2. #2
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    Quote Originally Posted by Caturdayz View Post
    " A stone is thrown vertically upward from the edge of a building 300 m high with an initial velocity of 10 m/s. Missing the building on the way down, what is the...

    A) Time of flight

    B) Velocity of the stone before impact with the ground

    I've got

    D= 300 m
    V0= 10 m/s
    A= 9.8 m/s^2
    T= ?
    V= ?

    I don't know the formula without those two variables, any help would be greatly appreciated.
    (a) \Delta y = v_o t - \frac{1}{2}gt^2

    sub in what you know ... solve the quadratic for t


    (b) v_f^2 = v_o^2 - 2g(\Delta y)


    remember that \Delta y is a vector
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