document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=949108>Question 949108</A>: <I><SPAN STYLE=\"word-break: break-all;\"> an object is thrown upward from the top of a 48-foot building with an initial velocity of 32 feet per second. the height h of the object after t seconds is given by the quadratic equation h=-16t^2+32t+48. when will the object 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 #579422 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><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=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=579422\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> we are given<BR>\n" );
document.write( "h=-16t^2+32t+48<BR>\n" );
document.write( "when object hits the ground, h = 0, therefore<BR>\n" );
document.write( "0 = -16t^2+32t+48<BR>\n" );
document.write( "divide both sides of = by 16<BR>\n" );
document.write( "-t^2 +2t + 3 = 0<BR>\n" );
document.write( "factor equation<BR>\n" );
document.write( "(-t+3)(t+1) = 0<BR>\n" );
document.write( "then we have t = 3 and t = -1<BR>\n" );
document.write( "we want the positive value for t <BR>\n" );
document.write( "the object will hit the ground in 3 seconds<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );