document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=451727>Question 451727</A>: <I><SPAN STYLE=\"word-break: break-all;\"> if a model rocket was measured by the vertical motion model h=-16t2+96t, how many seconds would it take for the model rocket to reach 80 feet for the second time?\r<BR>\n" );
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document.write( "My math teacher asked a similar vertical motion question and if i see this one worked out i might understand it better.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #310614 by </B><A HREF=/tutors/aboutme.mpl?userid=benn143><B>benn143(2)</B></A><img src=\"/images/stars/iconNewId_16x16.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=benn143><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=310614\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> First set it up like it says.<BR>\n" );
document.write( "80=-16t^2+96t<BR>\n" );
document.write( "then subtract the 80 from both sides.<BR>\n" );
document.write( "0=-16t^2+96t-80<BR>\n" );
document.write( "then divide the whole thing by -16.<BR>\n" );
document.write( "0=t^2-6t+5<BR>\n" );
document.write( "then you simply factor and solve<BR>\n" );
document.write( "0=(t-5)(t-1)<BR>\n" );
document.write( "t-5=0 t-1=0<BR>\n" );
document.write( "t=5 or t=1<BR>\n" );
document.write( "Now these answers are when the rocket hit 80 feet on its way up and way down.<BR>\n" );
document.write( "So the answer would be 5 seconds because it takes longer to come down.<BR>\n" );
document.write( "Hope that helps!<BR>\n" );
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