document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=227699>Question 227699</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A rock falls from rest off a high cliff. How far has the rock fallen when its speed is 39.2 meters per second? [Neglect friction.]<BR>\n" );
document.write( "19.6 m <BR>\n" );
document.write( "44.1 m <BR>\n" );
document.write( "78.3 m<BR>\n" );
document.write( "123 m \r<BR>\n" );
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document.write( "-what does neglect friction mean ? i dont quite understand </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #169156 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><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=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=169156\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> friction with the air (or any fluid) will act against the gravitational force that accelerates a falling object<BR>\n" );
document.write( "___ this is why skydivers reach a \"terminal velocity\"; the force of atmospheric friction equals the force of gravity\r<BR>\n" );
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document.write( "time = velocity / acceleration\r<BR>\n" );
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document.write( "distance = 1/2 * acceleration * (time)^2\r<BR>\n" );
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document.write( "substituting ___ distance = 1/2 * (velocity)^2 / acceleration\r<BR>\n" );
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document.write( "d = 1/2 * (39.2)^2 / 9.81 = 78.3 </SPAN>\n" );
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