document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=62553>Question 62553</A>: <I><SPAN STYLE=\"word-break: break-all;\"> AN OBJECT IS PROJECTED UPWARD FROM THE TOP OF A TOWER.  ITS DISTANCE IN FEET ABOVE THE GROUND AFTER t SECONDS IS GIVEN BY s(t)=-16t2+64t+80.  HOW MANY SECONDS WILL IT TAKE TO 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 #43323 by </B><A HREF=/tutors/aboutme.mpl?userid=funmath><B>funmath(2933)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=funmath><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=43323\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> AN OBJECT IS PROJECTED UPWARD FROM THE TOP OF A TOWER.  ITS DISTANCE IN FEET ABOVE THE GROUND AFTER t SECONDS IS GIVEN BY s(t)=-16t^2+64t+80.  HOW MANY SECONDS WILL IT TAKE TO REACH THE GROUND?<BR>\n" );
document.write( "s(t)=0 when the object is on the ground, so set the problem = 0 factor and solve.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0=-16t%5E2%2B64t%2B80 ALIGN=MIDDLE  ALT=\"0=-16t%5E2%2B64t%2B80\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0=-16%28t%5E2-4t-5%29 ALIGN=MIDDLE  ALT=\"0=-16%28t%5E2-4t-5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0%2F-16=-16%28t%5E2-4t-5%29%2F-16 ALIGN=MIDDLE  ALT=\"0%2F-16=-16%28t%5E2-4t-5%29%2F-16\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0=t%5E2-4t-5 ALIGN=MIDDLE  ALT=\"0=t%5E2-4t-5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0=%28t-5%29%28t%2B1%29 ALIGN=MIDDLE  ALT=\"0=%28t-5%29%28t%2B1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "t-5=0 and t+1=0<BR>\n" );
document.write( "t=5 and t=-1<BR>\n" );
document.write( "ignore the negative value it it's not pertinent.<BR>\n" );
document.write( "t=5 s for the object to hit the ground.<BR>\n" );
document.write( "Happy Calculating!!!!<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );