document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=975274>Question 975274</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a toy rocket is launched upward from a height of 1.3 m above the ground. The height of the rocket, in meters, after t seconds is modeled by the equation h=-4.9t^2+51t+1.3 What is the maximum height and when does it reach that height?<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 #597054 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=597054\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> h=-4.9t^2+51t+1.3 <BR>\n" );
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document.write( "Max ht is the vertex at t = -b/2a<BR>\n" );
document.write( "t = -51/-9.8 = 255/49<BR>\n" );
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document.write( "hmax = -4.9(255/49)^2 + 51*255/49 + 1.3<BR>\n" );
document.write( "=~ 134 meters<BR>\n" );
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document.write( "PS  That's not a rocket.  Rockets have thrust.<BR>\n" );
document.write( "It's a projectile.<BR>\n" );
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