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Math Help - quadratics, text question

  1. #1
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    quadratics, text question

    I don't really know where to start, how could i go about awnsering this question? any help at all would be much appreicated..

    "The height h(t) in feet of an object t seconds after it is propelled straight up from the ground with an initial velocity of 60 feet per second is modeled by the equation h(t)= -16t^2 +60t At what times will the object be at a height of 56 feet?"


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  2. #2
    Bar0n janvdl's Avatar
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    Quote Originally Posted by 14041471 View Post
    I don't really know where to start, how could i go about awnsering this question? any help at all would be much appreicated..

    "The height h(t) in feet of an object t seconds after it is propelled straight up from the ground with an initial velocity of 60 feet per second is modeled by the equation h(t)= -16t^2 +60t At what times will the object be at a height of 56 feet?"

    -16t^2 + 60t - 56 = 0

    Solving for t we find the following:

    t = 1.75 or t = 2

    It is logical that it will reach that height at 2 distinct times.

    At 1.75 secs it is still going upward, and at 2 seconds it has already reached the vertex and is now moving downward.
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