document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=962236>Question 962236</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A stone is thrown upwards, the distance travelled is given by s = 1 + 4t – 8t² then the distance travelled by the stone is ? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #587878 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=587878\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A stone is thrown upwards, the distance travelled is given by s = 1 + 4t – 8t² then the distance travelled by the stone is ?<BR>\n" );
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document.write( "Find the highest point and the time to get there.<BR>\n" );
document.write( "It's the vertex of the parabola, at t = -b/2a<BR>\n" );
document.write( "t = -4/-16 = 1/4 second<BR>\n" );
document.write( "s(1/4) = 1 + 1 - 1/2 = 1.5 units (feet?)<BR>\n" );
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document.write( "Had it started at ground level, the distance up would equal the distance falling, but it was 1 ft AGL, so 1 had to be subtracted.<BR>\n" );
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document.write( "Distance = 2*1.5 - 1 = 2 feet </SPAN>\n" );
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