document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1066609>Question 1066609</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A projectile is launched from ground level with an initial velocity of v0 feet per second. Neglecting air&#8203; resistance, its height in feet t seconds after launch is given by s=&#8722;16t^2+v0t. Find the&#8203; time(s) that the projectile will&#8203; (a) reach a height of 96 ft and&#8203; (b) return to the ground when v0 = 112 feet per second. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #681801 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=681801\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> s=-16t^2+112t<BR>\n" );
document.write( "96=-16t^2+112t<BR>\n" );
document.write( "0=-16(t^2-7t+6), moving the 96 over and dividing everything by -16<BR>\n" );
document.write( "(t-6)(t-1)=0<BR>\n" );
document.write( "t=1, 6 seconds on the parabola.<BR>\n" );
document.write( "It hits the ground when s=0 and -16t^2+112t=0; -16t(t-7)=0; t=7 seconds. t=0, of course, because it started there.\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28300%2C300%2C-10%2C10%2C-10%2C200%2C-16x%5E2%2B112x%29 ALIGN=MIDDLE  ALT=\"graph%28300%2C300%2C-10%2C10%2C-10%2C200%2C-16x%5E2%2B112x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );