document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1011455>Question 1011455</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A toy rocket is launched straight up into the air with an initial velocity of 60 ft/s from a table 3 ft above the ground. If acceleration due to gravity is –16 ft/s2, approximately how many seconds after the launch will the toy rocket reach 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 #627102 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=627102\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> H(t)=-16t^2+60t+3<BR>\n" );
document.write( "find the zero where t is positive<BR>\n" );
document.write( "-16t^2+60t+3=0<BR>\n" );
document.write( "t=(-1/32){-60 +/- sqrt (3600+192); sqrt 3792=61.58<BR>\n" );
document.write( "use negative root<BR>\n" );
document.write( "t=(-1/32)(-121.58)=3.80 sec<BR>\n" );
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