document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=890382>Question 890382</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In the equation s=ut=1/2at^2 why is A (9.81) negative  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #538933 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=538933\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> By convention, the y axis represents height. \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "y = 0 represents the ground and y = 10 represents 10 ft off the ground (or 10 m, 10 cm, whatever unit you're using)\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Since gravity pulls the object down, and because the negative direction on the y axis is pointed down, it makes sense to say <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a+=+-9.81 ALIGN=MIDDLE  ALT=\"a+=+-9.81\"   DISABLED_style= \"max-width:90%; height:auto;\" >. This ensures we have an upside down parabola. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );