document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=58886>Question 58886</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)=16t^2+64t+80.  How many seconds wil it take to reach ground level? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #40387 by </B><A HREF=/tutors/aboutme.mpl?userid=venugopalramana><B>venugopalramana(3286)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=venugopalramana><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.geocities.com/venugopalramana/FREE_MATHS_ASSISTANCE.html valign=middle><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=40387\">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 wil it take to reach ground level?<BR>\n" );
document.write( "I THINK THE FORMULA IS S = -16T^2+64T+80 WHEN IT IS THROWN UP.<BR>\n" );
document.write( "ASSMING SO...<BR>\n" );
document.write( "at t=0, when it is thrown up we have <BR>\n" );
document.write( "s=0+0+80=80<BR>\n" );
document.write( "hence the tower is at 80' from ground.<BR>\n" );
document.write( "WHEN THE OBJECTS FALLS ON GROUND ITS DISTANCE FROM GROUND =0<BR>\n" );
document.write( "S=0<BR>\n" );
document.write( "-16T^2+64T+80=0<BR>\n" );
document.write( "T^2-4T-5=0<BR>\n" );
document.write( "T^2-5T+T-5=0<BR>\n" );
document.write( "T(T-5)+1(T-5)=0<BR>\n" );
document.write( "(T-5)(T+1)=0<BR>\n" );
document.write( "T=5 SEC.<BR>\n" );
document.write( "IT WILL TAKE 5 SEC TO HIT THE GROUND.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );