document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=779503>Question 779503</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A rock is dropped into an abandoned mine and a splash is heard 9 s later. Assuming that it takes a negligible time for the sound to travel up the mine shaft, determine the depth of the shaft and how fast the rock was falling when it hit the water. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #475238 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=475238\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A rock is dropped into an abandoned mine and a splash is heard 9 s later. Assuming that it takes a negligible time for the sound to travel up the mine shaft, determine the depth of the shaft and how fast the rock was falling when it hit the water.<BR>\n" );
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document.write( "s = at^2/2 = 4.9t^2/2<BR>\n" );
document.write( "s = 198.45 meters deep<BR>\n" );
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document.write( "v = at = 9.8*9<BR>\n" );
document.write( "v = 88.2 meters/sec at impact<BR>\n" );
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