document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=387938>Question 387938</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A ball is thrown upward with an initial speed of 24.5 m/s. When is it 19.6m high?<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #274242 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=274242\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You didn't specify the equation of motion, or the starting height.<BR>\n" );
document.write( "---------<BR>\n" );
document.write( "h(t) = -4.9t^2 + vt is commonly used, assuming h(0) = 0<BR>\n" );
document.write( "h(t) = -4.9t^2 + 24.5t<BR>\n" );
document.write( "-4.9t^2 + 24.5t = 19.6<BR>\n" );
document.write( "t^2 - 5t + 4 = 0<BR>\n" );
document.write( "(t-1)*(t-4) = 0<BR>\n" );
document.write( "t = 1 second going up<BR>\n" );
document.write( "t = 4 seconds descending<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );