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Math Help - [SOLVED] velocity QUESTION

  1. #1
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    [SOLVED] velocity QUESTION

    If a ball is thrown vertically upward from the roof of 64 foot building with a velocity of 64 ft/sec, then what is the maximum height the ball reaches?
    What is the velocity of the ball when it hits the ground?

    s(0) = 64
    v(0) = 64

    ??
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  2. #2
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    okay so the position function would be

    s(t) = -16t^2 + 128

    so the answer to part a would be 128

    but i still can't figure out the velocity when it would hit the ground

    v(t) = -32t
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  3. #3
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    never mind i figured it out..

    set s(t) = to 0 and plug that value into velocity function
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