document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=629590>Question 629590</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A model rocket is shot straight up from the roof of a school. The height at any time t is approximated by the model h=t^2 +3t +28, where h is the height in meters and t is the time in seconds. When does the rocket 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 #396398 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=396398\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A model rocket is shot straight up from the roof of a school. The height at any time t is approximated by the model h=t^2 +3t +28, where h is the height in meters and t is the time in seconds. When does the rocket hit the ground?<BR>\n" );
document.write( "-----------------<BR>\n" );
document.write( "It doesn't.<BR>\n" );
document.write( "h increases with t<BR>\n" );
document.write( "---<BR>\n" );
document.write( "At t=0, h = 28<BR>\n" );
document.write( "At t = 5, h = 68<BR>\n" );
document.write( "At t = 1000, h = 1,003,028<BR>\n" );
document.write( "etc<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "Rockets are like that, they have engines that produce thrust and acceleration.  They're not projectiles.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );