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Posted by on Thursday, December 2, 2010 at 9:21pm.

A hot-air balloon, headed due east at an average speed of v = 14 miles per hour and at a constant altitude of h = 120 feet, passes over an intersection (see the figure). Find an expression for its distance d (measured in feet) from the intersection t seconds later.

  • Precal - , Thursday, December 2, 2010 at 9:44pm

    The balloon travels 14mi/hr*t/3600 where t is in seconds. I suppose it would be better to change the velocity to ft/sec

    Memorize this conversion factor 60mph=88fps

    the balloon travels then 14/60*88 t feet.

    the triangle then yields a slant height of
    distance= sqrt (120^2+(14*88/60 t)^2 )

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