document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=494341>Question 494341</A>: <I><SPAN STYLE=\"word-break: break-all;\"> When a rock is dropped from a cliff into an ocean, it travels approximately 16t 2 feet in t seconds. If the splash is heard 2 seconds later and the speed of sound is 1100 ft/sec, approximate the height of the cliff. (Give the answer to two decimal places.)<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #335605 by </B><A HREF=/tutors/aboutme.mpl?userid=chessace><B>chessace(471)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=chessace><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=chessace><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=335605\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Drop for t sec from height x ft.<BR>\n" );
document.write( "x = 16 t^2<BR>\n" );
document.write( "x = 1100 * (2-t)<BR>\n" );
document.write( "16 t^2 + 1100 t - 2200 = 0<BR>\n" );
document.write( "t = (-1100 + sqrt(1100^2 - 4*16*(-2200)))/(2*16)<BR>\n" );
document.write( "=(-1100 + sqrt(1210000+140800))/32<BR>\n" );
document.write( "=(-1100 + 1162.24)/32<BR>\n" );
document.write( "=62.24/32 = 1.945 sec<BR>\n" );
document.write( "Sound travels for 0.055 sec,<BR>\n" );
document.write( "x = 60.5 ft<BR>\n" );
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