document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=386394>Question 386394</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An object is thrown downward from a plane which is 380 m above the ground. The object is thrown with an initial velocity of 20 m/sec. How long does 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 #273141 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=273141\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> s= ut*1/2*g*t^2<BR>\n" );
document.write( "s= distance<BR>\n" );
document.write( "u= initial velocit<BR>\n" );
document.write( "t= time<BR>\n" );
document.write( "380=20t+1/2*9.8*t^2<BR>\n" );
document.write( "380=20t+4.9t^2<BR>\n" );
document.write( "4.9t^2+20t-380=0<BR>\n" );
document.write( "multiply by 10<BR>\n" );
document.write( "49t^2+200t-3800=0<BR>\n" );
document.write( "find the roots by quadratic formula<BR>\n" );
document.write( "b^2-4ac=784800<BR>\n" );
document.write( "...<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x1=%28-200%2Bsqrt%28784800%29%29%2F98 ALIGN=MIDDLE  ALT=\"x1=%28-200%2Bsqrt%28784800%29%29%2F98\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "x1=6.998 seconds<BR>\n" );
document.write( "7 seconds<BR>\n" );
document.write( "..<BR>\n" );
document.write( "x2 will be negative & time cannot be negative<BR>\n" );
document.write( "...<BR>\n" );
document.write( "m.ananth@hotmail.ca </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );