document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=393274>Question 393274</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Set up equation for problem and solve\r<BR>\n" );
document.write( "\n" );
document.write( "1) An object is thrown up in the air at a velocity of 20 ft/sec.  The height of the object t seconds after it is thrown is given by the function h(t)= -16t^(2)+20t .  How long will it take for the object to hit 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 #279128 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=279128\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> An object is thrown up in the air at a velocity of 20 ft/sec. The height of the object t seconds after it is thrown is given by the function h(t)= -16t^(2)+20t . How long will it take for the object to hit the ground? <BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "Height is zero when the object hits the ground.<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Solve: <BR>\n" );
document.write( "-16t^2+20t = 0<BR>\n" );
document.write( "-4t(4t-5) = 0<BR>\n" );
document.write( "Positive solution:<BR>\n" );
document.write( "t = 5/4 = 1 1/4 seconds<BR>\n" );
document.write( "==========================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );