document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=276568>Question 276568</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A window washer is suspended 38 feet below the roof of the 1127-foot-tall John Hancock Center in Chicago. If the window washer drops an object from this heght, the object's height h after t seconds is given by the equation h=-16t^2+1089. Find how many seconds pass before the object reaches the ground. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #201541 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=201541\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A window washer is suspended 38 feet below the roof of the 1127-foot-tall John Hancock Center in Chicago. If the window washer drops an object from this heght, the object's height h after t seconds is given by the equation h=-16t^2+1089. Find how many seconds pass before the object reaches the ground.<BR>\n" );
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document.write( "It hits the ground when h = 0<BR>\n" );
document.write( "h=-16t^2+1089 = 0<BR>\n" );
document.write( "16t^2 = 1089<BR>\n" );
document.write( "4t = 33<BR>\n" );
document.write( "t = 8.25 seconds<BR>\n" );
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