document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1123163>Question 1123163</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A rock is thrown upward with a velocity of 18 meters per second from the top of a 36 meter high cliff, and it misses the cliff on the way back down.  When will the rock be 4 meters from the water, below?  Round your answer to two decimal places. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #739425 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=739425\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> draw this<BR>\n" );
document.write( "h=-9.8t^2+18t+36<BR>\n" );
document.write( "want h=4<BR>\n" );
document.write( "therefore <BR>\n" );
document.write( "-9.8t^2+18t+32=0<BR>\n" );
document.write( "t=(-1/19.6)-18+/-sqrt(324+1254.4); sqrt term is equal to 39.73, use negative root only<BR>\n" );
document.write( "t=(-1/19.6)(-57.73)=2.95 seconds<BR>\n" );
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document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );