document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=3274>Question 3274</A>: <I><SPAN STYLE=\"word-break: break-all;\"> SORRY!  I caught a typo error in my question!!  Given: h=-16 t squared +vt+ s, a ball can be thrown at 40 ft/s.  Set the initial height at 0.<BR>\n" );
document.write( "1.  a.)  When will the ball reach a height of 24 feet?<BR>\n" );
document.write( "    b.)  When does the ball hit the ground?\r<BR>\n" );
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document.write( "2.)  a.)  If the ball is thrown at 64 ft/s, when will it reach 48 feet?<BR>\n" );
document.write( "     b.)  When does the ball hit the ground?<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #1428 by </B><A HREF=/tutors/aboutme.mpl?userid=khwang><B>khwang(438)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=khwang><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=1428\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  h=-16 t^2 +vt+ s, s = 0, <BR>\n" );
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document.write( " 1.a)  v = 40 ft/s<BR>\n" );
document.write( "  When h = 24, solve the equation 24 = -16 t^2 + 40t or<BR>\n" );
document.write( "   2t^2 - 5t + 3 = 0, <BR>\n" );
document.write( "  Factoring (2t -3)(t - 1) = 0, so t = 1 or 3/2<BR>\n" );
document.write( "  Hence, when t = 1 or 1.5 sec, h = 24 ft<BR>\n" );
document.write( "  b) The height of the ground is h = 0, solve<BR>\n" );
document.write( "     -16 t^2 + 40t = 0 or 8t(2t -5) = 0.<BR>\n" );
document.write( "    So, t = 5/2 or 0(means initial)<BR>\n" );
document.write( "   Hence, when t = 2.5 sec, it hits the ground.<BR>\n" );
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document.write( " 2.a)  v = 64 ft/s<BR>\n" );
document.write( "  When h = 48, solve the equation 48 = -16 t^2 + 64t or<BR>\n" );
document.write( "   t^2 - 4t + 3 = 0, <BR>\n" );
document.write( "  Factoring (t -3)(t - 1) = 0, so t = 1 or 3<BR>\n" );
document.write( "  Hence, when t = 1 or 3 sec, h = 48 ft<BR>\n" );
document.write( "  b) The height of the ground is h = 0, solve<BR>\n" );
document.write( "     -16 t^2 + 64t = 0 or 16t(t -4) = 0.<BR>\n" );
document.write( "    So, t = 4 or 0(means initial)<BR>\n" );
document.write( "   Hence, when t = 4 sec, it hits the ground.\r<BR>\n" );
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document.write( " Kenny<BR>\n" );
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