document.write( "Question 250533: While hovering near the top of a waterfall in a national park at 6400 feet, a helicopter pilot accidentally drops his sunglasses. The height h(t) of the sunglasses after t seconds is given by the polynomial function h(t)=-16t^2+6400. When will the sunglasses hit the ground?\r
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Algebra.Com's Answer #185044 by dabanfield(803)\"\" \"About 
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While hovering near the top of a waterfall in a national park at 6400 feet, a helicopter pilot accidentally drops his sunglasses. The height h(t) of the sunglasses after t seconds is given by the polynomial function h(t)=-16t^2+6400. When will the sunglasses hit the ground?
\n" ); document.write( "The sunglasses will hit the ground after __ seconds.\r
\n" ); document.write( "\n" ); document.write( "Since the glasses hit the ground at height = 0 we have:\r
\n" ); document.write( "\n" ); document.write( "-16t^2 + 6400 = 0 or\r
\n" ); document.write( "\n" ); document.write( "16t^2 = 6400\r
\n" ); document.write( "\n" ); document.write( "Solving for t we have then:\r
\n" ); document.write( "\n" ); document.write( "t^2 = 400\r
\n" ); document.write( "\n" ); document.write( "t = +20 or t = -20\r
\n" ); document.write( "\n" ); document.write( "t = 20 sec.\r
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