document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1168151>Question 1168151</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A projectile that is fired vertically into the air with an initial velocity of 120 ft. per second can be modeled by the equation s = 120t  -  16t2. In the equation, s is the distance in feet of the projectile above the ground after t seconds.. How long will it take for a projectile to reach 216 feet? Is it possible for the projectile to reach 900 feet? Justify your answer. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #792793 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=792793\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A projectile that is fired vertically into the air with an initial velocity of 120 ft. per second can be modeled by the equation s = 120t  -  16t2. <BR>\n" );
document.write( "How long will it take for a projectile to reach 216 feet?<BR>\n" );
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document.write( "120t - 16t^2 = 216<BR>\n" );
document.write( "Solve for t.<BR>\n" );
document.write( "2 solutions, ascending and descending.<BR>\n" );
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document.write( "Is it possible for the projectile to reach 900 feet?<BR>\n" );
document.write( "Max height is the vertex, at t = -b/2a<BR>\n" );
document.write( "t = -120/-32 seconds<BR>\n" );
document.write( "Sub for t to find max height.<BR>\n" );
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