document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=476832>Question 476832</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 1. (30 points) In 1981, Vadimir Poliakov (USSR) set a world record of 19ft ¾ in for the pole vault (www.polevault.com).  To reach that height, Poliakov obtained a speed of approximately 36 feet per second on the runway.  The formula h = -16t2 + 36t gives his height t seconds after leaving the ground.	<BR>\n" );
document.write( "a.	Does the graph of this equation open up or down? How did you determine this? <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 #326928 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=326928\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The t^2 term is negative, so it opens down.<BR>\n" );
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document.write( "His horizontal speed is not directly related to his vertical speed, or the height reached pole vaulting, tho.  All this information is irrelevant.<BR>\n" );
document.write( "The formula h = -16t^2 + 36t applies to projectiles, not to pole vaulters.<BR>\n" );
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