document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=557924>Question 557924</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Where does the -16 come from in the vertical motion equation? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #362833 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=362833\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Where does the -16 come from in the vertical motion equation?<BR>\n" );
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document.write( "Earth's gravitational acceleration is apx 32.16 ft/sec/sec, 32 is often used.<BR>\n" );
document.write( "16 is 1/2 of that, in the equation s = at^2/2 = 16t^2<BR>\n" );
document.write( "It's negative because it's downward.<BR>\n" );
document.write( "--> -16t^2<BR>\n" );
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