document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=580633>Question 580633</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A penny is dropped from the top of a 900m tower. How long does it take to hit 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 #371320 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=371320\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A penny is dropped from the top of a 900m tower. How long does it take to hit the ground?<BR>\n" );
document.write( "------------<BR>\n" );
document.write( "s = at^2/2<BR>\n" );
document.write( "900 = 4.9t^2<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+sqrt%28900%2F4.9%29 ALIGN=MIDDLE  ALT=\"t+=+sqrt%28900%2F4.9%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "t =~ 13.55 seconds (neglecting air friction) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );