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Math Help - Rocket Launched

  1. #1
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    Rocket Launched

    A small rocket is launched from a height of 72 feet. The height of therocket in feet,
    h, is represented by the equation h(t) = –16t2 + 64t + 72, where t = time, in seconds. Graph this equation.

    Use your graph to determine the number of seconds that the rocket will remain at or above 100 feet from the ground.

    Last edited by magentarita; September 24th 2008 at 01:41 PM. Reason: Remove some words
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  2. #2
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    Quote Originally Posted by magentarita View Post
    A small rocket is launched from a height of 72 feet. The height of therocket in feet,
    h, is represented by the equation h(t) = 16t2 + 64t + 72, where t = time, in seconds. Graph this equation.

    Use your graph to determine the number of seconds that the rocket will remain at or above 100 feet from the ground.

    You have to draw 2 graphs:

    1. h(t) = -16t^2+64t+72 and

    2. y = 100

    The period of time you are looking for is represented by the distance between the 2 intersections of these 2 graphs.
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  3. #3
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    Excellent....

    Quote Originally Posted by earboth View Post
    You have to draw 2 graphs:

    1. h(t) = -16t^2+64t+72 and

    2. y = 100

    The period of time you are looking for is represented by the distance between the 2 intersections of these 2 graphs.
    Excellent reply!
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