document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=79507>Question 79507</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An object is shot straight up into the air from ground level with initial speed of 24 ft/sec. The height of the object (in feet) is given by the equation h=-16tsquared+24t, where t is the time in seconds after launch. Find the time(s) when the object is at 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 #57061 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=57061\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> An object is shot straight up into the air from ground level with initial speed of 24 ft/sec. The height of the object (in feet) is given by the equation h=-16tsquared+24t, where t is the time in seconds after launch. Find the time(s) when the object is at ground level.<BR>\n" );
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document.write( "At ground level the height is zero.<BR>\n" );
document.write( "To get the time let h=0 and solve for t:<BR>\n" );
document.write( "-16t^2+24t=0<BR>\n" );
document.write( "-8(2t^2-3t)=0<BR>\n" );
document.write( "2t^2-3t=0<BR>\n" );
document.write( "t(2t-3)=0<BR>\n" );
document.write( "t=0 or t=3/2<BR>\n" );
document.write( "This means the object was on the ground to start with (t=0)<BR>\n" );
document.write( "and will be on the ground again in 1.5 seconds (t=3/2)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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