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Math Help - Function word problem

  1. #1
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    Function word problem

    Hi, i have this word problem that i need to solve, however i'm not really sure how to start it...
    Help would be much appreciated.

    Problem:
    A person standing close to the edge of a 200 foot tall builfing throws a baseball upward, such that its height above the ground in feet, s(t), after t seconds, is given by s(t)=-16t^2+64t+200
    a) How long will it take for the ball to hit the ground?
    b) When will the ball reach its maximum height?
    c) What is the max height the ball reaches?q
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  2. #2
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    Quote Originally Posted by wafflemypanda View Post
    Hi, i have this word problem that i need to solve, however i'm not really sure how to start it...
    Help would be much appreciated.

    Problem:
    A person standing close to the edge of a 200 foot tall builfing throws a baseball upward, such that its height above the ground in feet, s(t), after t seconds, is given by s(t)=-16t^2+64t+200

    a) How long will it take for the ball to hit the ground?

    set s(t) = 0 and solve for t

    b) When will the ball reach its maximum height?

    find the vertex of the graph of s(t) ... t = -b/(2a)

    c) What is the max height the ball reaches?

    evaluate s(t) for the time found in part (b)
    ...
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